We cruise on Monday, yeah!!!! Packing now and have a quick question about pillowcases to leave at guest services for the characters to sign. Do those of you who've done this recommend Sharpies or fabric markers? I'm making my girls their pillowcases, light sparkly pink with a character border. Want to make sure the signatures stand out in the pink background and that they don't wash off. The fabric markers we have say you have to iron to set. We also have both thin and thick (regular) sharpies. Any experience with this will be greatly appreciated!