Design a T-Shirt Fantasy

I want a design for LexiCon Tabletop Gaming Convention, held in Lexington in 2015. The design will be for T-Shirts and for the cover of our Program. My vision is to have a Scientist (with beaker), a Superhero, and a Wizard, one character should be female, working together, fighting a monster of some sort (Dragon, Troll, make up your own...) The three figures represent three different types of gaming characters. It might even be fun if they were fighting lots of Meeples (just a thought, humor is appreciated). The image must include "LexiCon 2015" (Capital"C" in middle) in larger letters and "Gaming Convention" and "Lexington KY" in smaller letters. For the "tone or spirit" like lighter rather then darker theme. Our "colors" are green, royal blue, and yellow, if they can be used prominently, would be nice, but not mandatory. A usable LexiCon 2015 logo would be nice, but not required. We will list the artist and contact information in the inside cover of our program and also list this information on our Facebook Site and our Web site. Will send a copy of the program and a T-Shirt. If you want, will send you free admission badge to Convention in Lexington KY and of course a fee, but we are a small convention...