Kids sharing a room.??

zammy
So I was wondering if any of yalls kids are sharing a room? I have a 3 year old son that started sleeping alone about 1 month ago..but problem is we only have a small 2 bedroom apartment :/ how can I decorate the room half for a boy and the other half for a girl?? We really don't want my son getting jealous or anything so we wonna put the baby in the crib sense we get home..any suggestions???