This is one shirt from Fullbleed. He does amazingly poetic t-shirts usually with some sort of symbolism and his shirts almost always include a person as a filled outline. They're at http://www.dobi.nu/fullbleed/.
This is one of the more contemporary shirts I've seen. Its from the Japanese Shikisai brand and though the shirts are rather expensive the fact that they're interactive makes them well worth it. They can be found at http://www.loopto.com/notofusai/
This shirt from The Imaginary Foundation is one of my favorite shirts to date. Similar to Fullbleed in concept, they are a more well know brand that favors a more computer generated looking design. You can find them at