I have some plastic tile about 4 feet up on one wall in the bathroom (where the vanity and toilet are. It does not go into the shower at all (I just had that all newly tiled with ceramic tiles). Eventually I plan on redoing this with glass mosaics, but in the meantime I am wondering if there is a way to paint them? They were probably white at one time but they have yellowed terribly, and compared to the new ceramic tile and the door/window trim they look horrible. Anyway to fix this until I can replace it? Thanks!