Got two ideas for you guys this week, I have no plans to use them, so they are free game for use/abuse!
First one is the Sons of Frost Space Marine Chapter. I see them as mostly codex... Just that a lot of their equipment is modified to use cold rather then heat. Their flamers and meltaguns actually use liquid nitrogen, and their bolters use a small amount in the ammo as well. Their color scheme is supposed to be cold, blues and whites. No obvious changes on the tabletop, unless you model it. ;)
The second offering is the Reckless Angels. I wouldnt be surprised to see these use the Blood Angels list, or maybe the Black Templars (within reason, of course). They have a preference for flashy actions, lots of melee charges, and failing that, huge explosions. Sadly, sometimes their thirst for glory leads them to take unwise actions, such as using area weaponry close to their brothers in combat. Luckily, Power Armor has saved a great many of those brothers in the line of fire.
*Edit* Im also playing around with the layout of the ol' blog. Let me know what you think!