On my personal hobby blog (indy40k), I've started a series of tutorials chronicling the project that I'm currently working on. Project Space Marine is an army consisting of 151 space marines, each from a different chapter. The most recent tutorial is on the White Templars. I'll repost it here:
The White Templars use the following GW colors:
Chaos Black* (I used Black Grey from the Vallejo Model Color line, but Chaos Black will work as well)
Gunmetal Blue (from VGC)
I paint my bolters black and then edge highlight the bolter casing with Codex Grey. The detail piece on the bolter (skull, wing, aquila...in this case, it's a cross) is painted Codex Grey. The clip, barrel, and other details are painted with Gunmetal Blue, from Vallejo's Model Color line. Boltgun Metal is then drybrushed over the Gunmetal Blue, and the entire bolter receives a wash of Badab Black. The detail piece on the bolter is then edge highlighted with Codex Grey.
If you are trying to decide what chapter you want to start, or are building a space marine force and want some hobby tips, keep an eye out here or check out my blog at indy40k.blogspot.com