Don't worry...everyone is doing it. You don't have to buy a kit to make it your own, you can create your own designs by using Japanese paper tape, aka Washi Tape. Just found a great source a few miles down the road from me HERE.
Or you can just purchase a "skin" for your keyboard to protect it from crumbs and spills:
|Found on Amazon for $2.35 (click image for link)|
This in-depth study of the keyboard decoration trend was inspired by Making It Lovely