When I was down at 4Designers in London one of the design practices there spoke about how they did the branding and marketing for a company called TEEPAY. Essentially it's a project where you can submit your own designs for a t-shirt and make money out of it.
I thought this would be a really cool thing to get involved with because you can pretty much design anything to go on a t-shirt and there is the potential to make money if the design is really good. I'm sure we've all thought about designing our own t-shirts and if there is a company that can do the professional printing for us it would be a shame not to take this opportunity.
Just an idea...