I recently bought an acoustic bass guitar and found it difficult to play as there is no thumb rest. I didnt want to drill a hole in it so i came up with this clip on device. I use a simple binder clip. It also needs a foam pad (from CD holder) and a small bulldog clip.

This is my design for a pen stand/pen rack/pen holder. I always have pens and pencils rolling around on my desk and it is annoying. I wanted a simple stand that would be stylish and practical. Ideal for designers and artists. It hold 6 pens/pencils. Maximum diameter - 12mm. It will be available in a number of colours and I might enenbe able to customise bu adding text. Please leave comments, I will upload some photos of the actual model soon.