We opted for grayish blue walls so it wasn't quite so girly. (This may have been subconsciously influenced by the fact that I lived in an obscenely pink room for many years when I was younger.)
We found a tree decal on Etsy that was similar to the style of the artwork, and put it over the crib, which we got from IKEA. The bedding is Dwell Studio for Target, and continues that idea of abstract plant life. (Because of the controversy over bumpers, we used the one that came with the set as a makeshift window seat cushion.)
We claimed the walk in closet in her room for ourselves (filled to the rafters with the storage that used to fill her room) so we found a wardrobe system at IKEA to hold her clothes. On the side of the wardrobe we've hung the Jellybeans calendar.
A few other details:
Some framed paper in the entry way