Oh i do so loath a twee room name too...sorry.! although i do understand the need for identifying the groups. I like the idea of colours or animals, trees, flowers or toys this way they are gender neutral, non age defining not stereotypical etc . I've always been opposed to rooms that identify the age of the children caterpillar/cocoon/butterfly etc...makes me feel very uneasy but can't exactly tell you why! maybe something to do with age rather than stage. When we named ourselves for rainbows years ago we left it in the hands of the children (older of course) ...i think i ended up as something quite strange!