This is the profile picture for a joint account I'm in with DrCasHolmes and I think lion_inferno. I'm not quite sure about him. Anyways, this joint account is called SupernaturalCanines. You should check out and follow the three profiles on this page.

In the picture, B.C. has a wig on, matching Sam's hair and Buttons has a wig on that matches Dean's hair. I did indeed use two separate references, but I think B.C. and Buttons look pretty hot.
Elapsed time: 18 hours (I'm rounding because this was so long ago, the time might be inaccurate)