Hate to break it to you, but the moment you put it up on the Internet, you lost all control of who is allowed to use your designs or not. That's like Masashi Kishimoto saying, "Hey, guys, you can't cosplay as Naruto characters because I said so!"
Doesn't work that way. :/
EDIT: Realized this was kind of old. Woops.
Conventions I am attending:
Aki Con '11
Tooru [A-Channel] - 90%
Cosmos (original design: warrior) [Dissidia: Final Fantasy]
Flygon (gijinka) [Pokemon]