Are you talking about the computer keyboard? A couple of years back I bought some vinyl lower-case letter overlays for my son's full-sized keyboard, and he loves them to this day (prefers to type on that keyboard compared to a laptop). Here's a sample-- not sure if these are the ones I bought:

http://www.amazon.com/dp/B003IB77G8

Striving to increase my rate of flow, and fight forum gloopiness. sick