Nice product designer tool posted by the author. You can also visit this site which will also provides you aT shirt designer tool. Due to this you can create your t- shirt graphically as per your choice.Alternatively you can create design on various tools such as on wallet,belt,mobile phones,shoes,etc.

So, for more information about Product designer tools you can visit this site(link):-

http://www.panaceatek.com/t-shirt-tool-designer