Creating Website with Customized images Created from user input on Load

I have a project to create a website of T Shirts Vendor, where he wants to get user name on load of home. and based on this user name, he wants to update all T Shirts dynamically, such that every t shirt has username printed look a like on it. This will make user feel, that he is designing his own t shirt. Any idea which technology to use? any js or jquery plugin to create T Shirt imaages at runtime and display.