Tackling the hard stuff first
Pictureframes.com has an robust product offering with complex customization options on each product page. I worked with our ecommerce manager and UI developer to whiteboard our desktop and mobile UX. (tablet operates similarly to desktop) I then created mocks in photoshop and plugged them into an Invision prototype. I collaborated with an outside agency to implement the CSS.
Custom Product Page (desktop prototype)
Custom Product Page (mobile prototype)