Ok, this may have been asked before or perhaps it's blatantly obvious but how do I go about dyeing towels? I'm changing the bathroom and have lots of towels which are still perfectly good to use, however they won't go with the new colour scheme. I've heard that you can buy dye products to go in the washing machine but I'm slightly nervous about this. Any hints, tips or where to buy these things would be most welcome. The colour change will be from Beige to Blue.