Oh I think I might have found one....won't be able to try it out for a few hours....
Its called tile studio. Looks pretty cool and it came with a couple of examples (works with c++ as well!).
Please feel free to post any recommendations in the mean time!
Thanks!
EDIT: wow, I just made some tiles following a tutorial on their website. Never thought I could actually make ANYTHING that looked this good
(i'm no artist, so please understand...)
From left to right: grass, grass w/ road, tree, cloud, heart, yoshi egg, grapes, bananas, apple or cherry...., and a rock!