Well, I'll use this thread for both arts and sprites.
Sprites:
Robot Guard - ZX Style
Night Man - An 8-bit Mega Man Robot Master
A tileset for a Little Dude 2 that will probably never be done >.>;
Dread - ZX Style
Mega Man - Custom Style
All 5 of those are scratch, but some used refrences for stylewise issues (size, colors, shape, etc.) Non-PD. Don't even ask to use them, for the answer is no.
Art:
I'm lazy, so I'll just link you to my Devinart page.
C+C?