Glass Block Crafts?

I have about 70 old glass boxes. I want to make gifts from them. Does anyone have ideas on what to do with them without using lights? I have looked and searched everywhere I could! Lol... I do not want to go out and spend the time on drilling holes in them. I know I can still put whatever I want on them, but do you think it's OK not to do them with lights? I have a friend who used hers on her table and never plugs it in. So I need to know if this would be OK. Everywhere I have looked they all have lights, but I am covering the sides with lace and they will have a lot of items glued on them. I really don't want lights.