I made tons of these marble magnets as Christmas gifts and they were a big hit! I really enjoyed making sets of 6 that were personalized to the gift-receivers interests. Cutting photos from magazines seemed to work best because the colors would really Pop! Michaels sells tiny gift boxes that are the perfect size to hold a set, and the Container Store sells little tins that are cute to package them in too.
My mother is Korean, I decided to make her personal magnets saying important things (using Google Translate and my printer) to her. I used the directions from a site I found on Pinterest http://www.notmartha.org/tomake/marblemagnets/