This may not be the correct place to ask this type of question...

I'm looking for software that I can integrate into the add-to-cart process wherein which users can create their own design. Is there any product / software that anyone has come across that allows for this? Any and all ideas or suggestions warmly welcomed.

>>"Capabilities ( via. ajax/javascript? )"
>>>>Add/Upload/Size/(RE)Move Images
>>>>Add/Size/(RE)Move/Color Text
>>>>Color background
>>>Layers?

Thanks for taking the time to read over this.