There are lots of painted wood necklaces out there on the interwebs these days and I couldn't resist joining in on the fun.
Painting the beads is really easy. All you need is:
Tape off the area where you don't want paint and give it a rub with the sandpaper. Then do a coat or two of paint. Let dry and remove the tape.
To make your necklace, put the beads on string. Easy, peasy.