Doll Divine‘s Sailor Senshi Maker games are the answer to any aspiring Sailor Senshi’s prayers. The latest version of the game includes a crapload of customization options, and even options to dress your senshi up in gowns befitting a Moon princess!
Here’s my own senshi (not sure what to call her at the moment) in her various forms (Normal, Super, Eternal, Princess):
While you can keep it simple and stick to the fixed, customizable elements like I did above, you can also go crazy with the Sailor Senshi Maker’s click-and-drag elements. Here are some of the more creative Senshi/dolls I spotted on the “Highest Rated” dolls pages: