It's a monster set for a cave, using the same pallete I used in the "Face" icon submitted not long ago. They're to be used in a game.
P.S.:I hate skeletons. I'm not aware of how I should draw them at this size, and with only a few colors. Any help with that?
[EDITED] Finally had time to edit this. Added transparency as the background and a new monster: Something like a floating blademaster or so.