The idea is nice, I bet it is one of those things people (including myself) will say "Hey I thought of that too" but never did anything with it. You did! Also,

The idea is nice, I bet it is one of those things people (including myself) will say "Hey I thought of that too" but never did anything with it. You did! Also, something that holds me back from using your service is that I don't like the design for something like my wallet. It looks a bit sporty so I don't want to stick it on my nice leather wallet or slick laptop. What about creating a few different styles?