Some people, when they are expecting a baby, put together a proper nursery. I mean – check these nurseries out. We didn’t do this – it’s expensive and by the time you get around to redecorating, your children will be at least fifteen. I think my brother still had care bear wallpaper (my choice, aged seven) in his room when he left for university.
One way of cheating is to put up stickers – I love these ones from Decowall. For adults, I find it slightly twee but for children, they are awesome. The stickers are removable and don’t leave any marks – if you are organised, you can save the sheets they come on and take them with you when / if you move (I haven’t saved the sheets). To put them on, I just use a clean, dry tea towel.