First proof of concept sample just got finished. Took me about 5 hours to do one shoe. Still got another one to do. 
Really dig this idea. Going to try and push it further a bit. Change up the sizes of the triangles to create more iconic shapes and hopefully coincide a bit with the flex zones in the shoes. Might end up doing an ombre effect too. Smaller triangles in the toe area, gradually increasing towards the heel.