There was some challenge floating around on Tumblr, and it was to take a random Pokemon and see if you can take that design and tweak it enough to make individual characters that looked unique. I got Chikorita... and yeah. Here you go!
http://pokedesign.tumblr.com/ (Wow... I didn't even know there WAS a Tumblr for this until I looked! In that case, here you go.)
Link
Windicious
Do you possibly have a link to the challenge? This looks fun! And I like the tiny scared looking one xD