Tacky costume jewellery suddenly becomes cool when you make it yourself.
Step 1: Sources for materials
Small crystals (lead glass) or plastic "rhinestones" with flat backs can be purchased at craft stores. These are 2mm in diameter - I discovered later that I shoud have gotten bigger crystals, or smaller magnets in order for them to cover the magnets completely, but the earrings look all right as is. The magnets are neodymium discs 1/8" diameter by 1/32" thickness (3.2mm by 0.8mm), from kjmagnetics.com - very cheap, $2.00 for 25. Superglue...buy anywhere for under a dollar.
Tools: A pair of tweezers or forceps for picking up the crystals (if you can find plastic ones, these would be better than metal), and a toothpick for repositioning.