Last year we wrote about kamifusen, Japanese paper balloons that come in different shapes and colors that look great in a children's space. I've got six or seven that hang as a mobile, but look at what an impact a whole bunch of them can make.
Else of Olivelse bought several dozen of these paper balloons, blew them up and hung them together as a collection. Although we're usually fans of less being more, there definitely a case for more being more. When displayed together in a large quantity, inexpensive items can make a bold statement. It's a case of the whole being greater than the sum of its parts.