And also paint original phones, paint blank phone magnets (which you may then take home with you); crafts decorating gel (Christmas decorations, Easter eggs, etc.); sculpting in clay, etc.
Just imagine how glad your mum and dad will be. Grandparents, sisters, brothers or friends, too! When you give them a break or even just a Mastertel souvenir.
You know: a gift made by, not just skill but with love, is the most valuable.