Photo blocks, creative way to display photos. Use photos of the kids at holiday time, Halloween costumes, snow gear, red and white for valentines day, red white and blue for 4th, tinself of new years, first day of school, fall leaves, dressed in green for St Patricks. Oh the ideas!
Let the finished dotted tumblers dry for an hour, and then flip them over on the sheet pan. Place in a cold oven and bake at 350°F for 30 minutes to set the paint. Turn off the heat and allow the glasses to cool in the oven for an hour before handling.