For a first-gen Pokemon group cosplay with my friends Lord Zasz as Raichu, KateStrife as Dragonair, and Fishyfins as Tentacool. All except Raichu were designed by me. The original design can be viewed here:
http://tomecko.deviantart.com/art/Pokemon-Gijinka-Ancient-Japan-206677756
We even carried around matching plushies. I made mine myself because I don't like the colors of the official Pokemon plushie. First stab at plushie-making... still a lot to learn.