Maybe someone can use it
Starting solution for custom online T-shirt design
[url]http://www.intrapopture.com/home/jquery-t-shirt-designer-lite-version-free[/url]
Bit late.
2 exist. And it has to be said, that jquery one is awful.
[url]http://www.snorocket.com/addons/product-designer-addon.html[/url]