A Canvas.

This tutorial shows you how to create a template in Qstomizer for a canvas with 3 different sizes ("20x20", 20"x15" and 15"x20") and 3 different prices. Check the video:

A t-shirt with variations based on images (colors).

Video tutorial that shows you how to create a template with different options (sizes and colors) based on an image per color and how to link the color options of the template with the variants of the product.