Do you know anyone who "gets" to attend professional conferences? I go to several each year and so I collected the lanyards and brought a bunch with me. Passed them out to kids we met. Many of the kids loved the logos on the lanyards (OK, I am a techie so some of the companies might be considered "cool" or geeky, not sure which).
Humorously, MY kids (twin DSs 9) wouldn't wear them and kept the cards in their pockets. It worked but I was nervous.
Barbara
Remember - if you want to give your kids the ability to charge you cannot punch a hole in the card to attach it to the lanyard so you will need the type with the plastic card holder/pouch thingy