On the fly sign designer with paypal

We are currently using [login to view URL] for our online store. The problem is we want to have the customer be able to design their sign "live" so to speak. Like a t-shirt or business card design shopping experience. We have the different colors, shapes, and product images in house and can supply them. We need a database storage system that possibly uses Ajax or jQuery methods to have a client choose a shape, colored background, colored sign frame, and enter two lines of text with a choice of 7 fonts and have this system create the end result live on the webpage. The customer sees exactly what we're going to produce before buying the sign. Once the customer is happy with their choices we need to transfer the purchase to paypal for completion. demo site is: [login to view URL]~myeverbr/ what we're using now can be seen via the "shop online" button. Thank you, Scott-