As a developer-type, I'd pick an ecommerce solution like Shopify.com which has plugins like this one (http://apps.shopify.com/product-customizer http://apps.sho

As a developer-type, I'd pick an ecommerce solution like Shopify.com which has plugins like this one (http://apps.shopify.com/product-customizer http://apps.shopify.com/product-customizer) which you could either pay for or recreate yourself. I think most ecommerce sites will have something similar, it just depends on your other requirements. As for something standalone, I havent seen anything like it but it shouldnt be hard with some Javascript and backend code that filters and does image manipulation using libraries like imagemagick, etc.