I've used Sugru a lot and one of the things that bugs me is, if I open a sachet of Sugru and only use a little for a keycap or something ... I end up throwing the remainder in the bin.
I'm looking to make a nub for a little 4 way Dpad, and today I came across this site,
http://www.instructables.com/id/How-To-Make-Your-Own-Sugru-Substitute/?ALLSTEPSI like the idea of just being able to mix up a small amount of the stuff ... haven't tried it yet, but it looks ok, and you can colour it with a few drops of artists linseed oil paints.
