I picked up a plain white iPad case for $5, and tangled it.
I used a black Sakura IndentiPen, which flowed SO nice on the leather-like material.
Shading is with a grey Fabrico Dual-tipped marker,
and the red square is an Ultra-fine Point Sharpie.
The grey cast you see around my name is because it couldn't lay flat on the scanner.
It is really quite white!