Nice idea. Depending on where you sell this from you may want to check the laws about providing such a tool and if you need to verify anything about the customer before allowing a sale. For example in some parts of the USA one has to show proof of either being a licensed locksmith or a member of some law enforcemnt group.

Here's a good starting reference on the legality of owning lockpicks from state to state:

http://toool.us/laws.html

It doesn't cover sale / purchase, just ownership by state.

Wow, two different colors of green. That person must hate the color blind with a passion.

Sweet! Good find. :)