We dig the versatility and strength of Sugru, a friend to DIY-ers that is unfortunately shipped mainly from the UK. Want to make your own? Corn starch, silicone caulk, colouring paints and a few other materials can yield "Oogoo".
Instructables user mikey77 goes the extra mile in detailing not only how to make his at-home Sugru substitute, but also the variations of it you'll need for making conductive circuits. He also provides a whole lot of great use cases. We've previously pointed to Sugru as a mouse grip fixer and laptop cord fixer, but if you don't have to pay shipping on small packets of Sugru, you can feel free to experiment much more liberally.
How To Make Your Own Sugru Substitute [Instructables]