Bare Conductive Electric Paint
Soldering is hard. Using Bare Conductive Electric Paint ($10 and up) is easy. This ingenious paint is nontoxic, solvent-free, water soluble, and most importantly conductive, allowing you to simply draw usable circuits on a variety of surfaces, including paper, plastic, fabric, and even conventional circuit boards. It comes in handy, easy-to-use tubes, as well as jars — for larger applications — and in a variety of sets that include instructions and materials for completing a variety of electronics projects.