and a most worthy addition to the democratization-of-art category of tools: www.shirtmockup.com.
choose a tshirt [limited options but both nice], upload an art work, save.
so easy, quick, intuitive, i could go on and on and on...
|hole in my head|
|the most beautiful landscape [the little prince, remember?]|
|hug me rainbow|
the idea is to do it somewhere between having a service that's basically terrible when free but super awesome when paid [e.g. flickr] and a service that's so good free that no one ever pays [e.g. shirt mockup]. the only service i've found that treads this middle path is flavors.me--officially the only online service i pay for.
figure that out, digital.