Mobile Modern. If you've got a dull boring corner, consider hanging a bold graphic mobile! They add visual energy, but at the same time, the gentle movements are also quite soothing. We love this modern HEX Mobile by Walter (formerly Fold bedding). It comes in several colorways and are made of light weight powder coated steel here in the USA.
Walter also makes them in several other shapes. The HEX design is $80, but prices for the other designs go from about $70 to $120. They'd also make a great addition to a kids room! Check out Ohdeedoh's take on them here.