Sugru + magnets = anything stuck to anything
Jane from Sugru writes, "We've just announced Sugru's first ever kit - Make Things Magnetic. Magnets are f***ing awesome! and Sugru's new best friend - sorry LEGO, it's not you, it's us. Once you attach something you love with Sugru and these magnets - you'll never want to go back. Attach anything to anything with Sugru + magnets!"
I love Sugru, and now carry a couple pouches of it with me all the time. I can't even count the number of things I've fixed or improved with the long-lasting, super-adhesive, versatile air-drying polymer (most recently, a dashboard mount for my phone while I was in LA for a couple weeks). I have often combined Sugru with small rare-earth magnets in just this way, but the kit looks very handy.