Ladies, I need help!

First I have a 3 bedroom house, one of the rooms is really small but I’m able to have my twins in there (1 year a half) however we are having another one soon and I would really love a gorgeous nursery since Ive always been plain Jane and wanted something different. I will have my boy twin and the newborn in there since they are boys and have my 6 year old and the girl twin sharing the bigger room. Any cute ideas I can do.? With a toddler bed and crib? Or should I put all the babies in the big room and have my 6 year old in the smaller one?! Help.