DIY Glitter Magnets - an easy craft idea for kids too. J in the Library's note: Though glitter is almost guaranteed to be messy, this is a relatively easy project that would only take 2 library classes, or 2 meetings of a maker club.
Rain bow dots and sparkles. Put stickers down first on the mug. Dot all over with a Sharpie, then peel off the stickers before putting the mug in the oven! Cute for Christmas gifts if kids make for a parent.