I will be a vendor at a craft fair next month and the organizer has suggested, if we want, to have a small make and take at our table and we can charge a small fee. I'm struggling to come up with ideas. Most of the things I'm thinking of require melting oils (lip balms, solid lotion bar) and I don't know if there will be a microwave there. Has anyone else done this? What would be easy, with a minimal mess and has appeal?