My "personal" Space Marine chapter is the Doom Eagles, introduced (very) briefly in Codex: Ultramarines.  The Doom Eagles are one of the Primogenitor chapters, created following the Horus Heresy during the massive reorganization of the surviving Space Marine Legions known as the Second Founding.  The Doom Eagles' robust geneseed was derived directly from that of the Ultramarines Legion, and thus out of all the Loyalist first founding chapters, the Doom Eagles' closest kinship is with the Ultramarines.  The Doom Eagles regard the Ultramarines and the other Primogenitor chapters as brothers, both in battle and in blood, and they revere the Ultramarines' Primarch Roboute Guilliman as their own.  Fundamental to the character of the Doom Eagles is their respect for Guilliman's immense strategic and organizational prowess; the Doom Eagles adhere firmly to the Codex Astartes that Guilliman laid out to govern the tactics and organization of all the Space Marine chapters.

     The Doom Eagles' reverence for the Emperor, and in particular the icon of the Imperial Eagle, outdistances even this feeling though.  In the litanies of the chapter, the Emperor is alluded to as a great eagle, sure of sight, sure of mind, fast of wing and lord of all he surveys.  The Emperor protects and defends all of humankind from the likes of horrible predators from the warp, alien invaders, and heresy from within, in the same manner as the great eagle keeps its young safe from predators, invaders, and discord.  As the Imperial Eagle sees all, and at the first sign of danger is ready to plummet earthwards to inflict horrible injury, defeat, and death on its foes, so too must the Doom Eagles be ever-vigilant, ready at the first sign of danger to eradicate the enemies of the Emperor and mankind.  The Doom Eagles' devotion to the protection of their charges is absolute and unbendable.
 
     The "Eagle" motif of the Doom Eagles can be seen in their relatively frequent use of Lighting Claws as weapons for close-combat oriented characters.  The "standard" character Lightning Claw is actually more of a Talon, with three wickedly curved, powered blades attached to the back of a relatively standard power glove housing.

     The Doom Eagles armor is silver, with red chest eagles, weapon casings, backpacks, and so on.  Exposed wires and cords are black, as well as exposed weapon barrels, clips, blades, etc.  Organizational markings follow the guidelines laid down by the Codex Astartes, with markings for Tactical, Assault, and Devastator squads identical to those used by the Ultramarines chapter.  The company color of each marine in power armor is mirrored on his right kneepad, or right lower leg if using power armor without kneepads (Mk 6 legs).  Segeants have red helmets, while squad leaders have silver helmets with a red stripe down the center.  Veterans (and thus all Terminators) have white helmets, and Veteran Sergeants (both in power armor and terminator armor) have red helmets with a white stripe down the center.
 
     For the moment, that is all the "fluff" that I really have had the time to work out completely and write down.
 

Doom Eagles
HQs
	Captain Thyrsus of the 3rd Company (Commander)       Standard Equipment:  Artificer Armor, Bionics, Terminator Honors, Frag & Krak Grenades, Bolter/Plasma Combi-Weapon, Lightning Claw (single).  Cost: 133 points.       Notice the Lightning Claw - All of the Lightning Claws on power-armored troops in the army are conversions, using various Power Fists (either modeled on the miniature, plastic off the current CC weapon sprue, or as this one off the old Beakie marine sprues) along with three SM combat knives that have been shaved down and attached, with putty to build up the talon's "knuckle."
	Chaplain Entheus of the 1st Company       Standard Equipment:  Terminator Armor (& Honors), Rosarius, Crozius Arcanum, Thunder Hammer, Purity Seals, Teleport Homer.  Cost: 135 points.
	Lexicanium Cadmus (Librarian)       Standard Equipment:  Frag & Krak Grenades, Bolt Pistol, Force Sword.  Cost: 104 points.
	Techmarine Sarcio       Standard Equipment:  Servo-Arm, Signum, Bolt Pistol, CCW.  Cost: +45 points to Command Squad.
	Apothecary Catius of the 3rd Company       Standard Equipment:  Narthecium, Bolt Pistol, CCW.  Cost: +25 points to Command Squad.
Elites
	Squad Acheron, 1st Squad of the 1st Company  Tactical
	Kyros, 1st Dreadnought of the 1st Company       Standard Equipment:  Plasma Cannon, Heavy Flamer and Dreadnought CCW.  Optional Equipment:  Terminator Honors and Purity Seals.  Cost: 125 / 145 points.       Note that the Terminator Honors and Purity Seals are not normally available to Dreadnoughts; thus I have decided to give Kyros "semi-character" status, due to his special nature as a Dreadnought of the 1st (Veteran) Company.  The Purity Seals have absolutely no effect, since Dreadnoughts never take Morale checks, so that the overall effect of these two items is just to give Kyros +1 Attack.  I feel that this is balanced for +20 points (the total cost of the two items).  Both of these items are modeled on Kyros himself.
	Tychon, 2nd Dreadnought of the 3rd Company       Standard Equipment:  Assault Cannon, Storm Bolter and Dreadnought CCW.  Cost: 105 points.
Troops
	Squad Aeneus, 2nd Squad of the 3rd Company  First Combat Squad  Tactical
	Squad Aeneus, 2nd Squad of the 3rd Company  Second Combat Squad  Tactical
	Squad Magnus, 3rd Squad of the 3rd Company  First Combat Squad  Tactical
	Squad Magnus, 3rd Squad of the 3rd Company  Second Combat Squad  Tactical
Fast Attack
	Squad Azarel, 8th Squad of the 3rd Company  First Combat Squad  Assault
	Squad Azarel, 8th Squad of the 3rd Company  Second Combat Squad  Assault
Heavy Support
	Squad Conservatio, 10th Squad of the 3rd Company  First Combat Squad  Devastator
	Squad Conservatio, 10th Squad of the 3rd Company  Second Combat Squad  Devastator
not pictured	Predator Destructor       Standard Equipment:  Turret-mounted Autocannon, Sponson-mounted Lascannons.  Cost:  125 points.

Allied Heroes of the Imperium
	Culexus Assassin

     Eric Strom (aka Elrond)
     Chapter Master of the Doom Eagles
 

All the above is pretty much mine, please don't use it for something funky, ok?  Direct comments and (especially) pointers to:
          <ESElrond@aol.com>
or, if you're from the WH40K Mailing List, you might better recognize me from my other email address:
          <elrond@ugcs.caltech.edu>