I'd like it, if the new hairstyles and colours we buy for diamonds, we owned. As it is, you can have one hair colour to go with an outfit, but when you change colour, the previous one you bought gisappears, and you have to buy it again, to use it. Same goes with underwear.
Also, I'd like to see a colour picker for clothes. Say a sliding scale of colour, for clothes and shoes, so toons could become more personalised. Not all clothes, the Holiday and event specials would remain. But the generic items that everyone goes through