Totes or one of those storage containers that has drawers or stackable bins that kind of look like laundry baskets
Or you could use the plastic sterilite things. And they have different colors sometimes....they are pretty sturdy and they dont take up a whole lot of room.
http://m.target.com/p/10-pocket-3-shelf-sweater-organizer-natural-blended-canvas/-/A-13051001
Closet organizer? Hangs vertically so shouldnt take much room
Ok keep in mind i have sizes newborn until 24 months.
Pinterest has some really cute ideas. Search nursery