Perhaps offer them to local shows for maybe clear round rossettes or specials. They can take the centre out and get new centres for them. Or even a local charity show or something like that. Again they can get new centre and would appreciate not having to fork out for rosettes which can be quite expensive. Or places that are just having a one off show to raise some money. Or organise your own little show and use them and send the money to a horse charity or something.