Ubercart

That's part of why I wrote node checkout... you could use a node form as the product builder and tie that to the product for purchasing. It requires a little bit of extra code to work well, but it might be a start for you. Also, the module doesn't address by itself doing something like a preview to overlay the logo on the product.

Thanks Ryan.

I'm doing it for a large pen manufacturer and really love the freedom ubercart gives me.

What I need is to give the user control to upload a logo and maybe resize, recolour etc. And then over lay the image as you said.

But I'm more of a designer than coder so any ideas pointing me in the right direction of how to approach this would be amazing. Could it be done with existing modules or would I be looking at coding from scratch.

I love this whole community development structure. And the fact what ideas put up are listened to.