Not sure if it's taboo to mention Danbooru here (if it is, let the pitchforks and torches rain upon my head) but just do a search for touhou and genderswap.
Make an account name to do two tags at once, seperated by a space. Found a really cool picture of genderswapped Alice and Marisa (Alex and Marcus?), and I'm having my friend make the (male) Alice outfit for my Halloween costume this year. If you want, I can host said pictures on my photobucket and link them here.