Arduinos are great, but the exposed circuitry on the bottom could short out if accidentally touched to something conductive. We made tiny feet from balls to Sugru. Sugru is non-conductive, and it also lifts the Arduino up a little off the surface.
1-2 packets of Sugru (depending on the size foot you would like)
Step 1: Roll Sugru into little balls
Roll into 4 small balls. Here we show two balls with an Arduino.