The t-shirts will not be t-shirts you wear to the gym or to bed. They are AWESOME enough to wear on the street, to work and meetups. The image should be able to scale easily to all t-shirt sizes and work for all genders.
Color is up for debate but something darker- likely gray-scale- not white or black. Think slate, something neutral. Suggestions happily taken.
The main theme is "I <3 APIs". We'd like our logo on there too but not picky about where it goes- front or back, on the side, whatever. The logo should not be huge, but needs to be readable. "I <3 APIs" is the main message to get across.
Take a look at our website (http://www.apigee.com), our "I <3 APIs" stickers (http://apigee.com/blog_detail/i_hea…i_stickers) for basic treatment philosophy and attached logo for color scheme basics and "Brand feel".
We are looking for something bold but not obnoxious- something clean and slick, not cluttered, but still playful.