I thought I'd link to some of the fan art posted over on tumblr, because I know some people here don't visit there and it never seems to be brought over to LJ.
Gag reel chibis. (G rated) All together now, awwwww!
Wincest Angst. (PG-13) I don't know if it's the boldly defined muscles or the dramatic coloring I like best about this.
Badbastion. (nc17) Need I say more? Okay, bottom!Sam. ;)
Sam Winchester’s Journal. (pg) I think this from the end of Season 8? This kind of takes my breath away a little. The limited color palatte, the slight smear to it, the emotion really bleeds through. (
Part 2)
Photomanip. (PG13) I'm usually not a fan of headless torsos, but this one packs a lot of character in.
Even the gifsets are awesome. (G) Weecest.
There's also the new comm
spn_colorme which is word search games and line art you can practice on and color yourself.