My sister wanted a fresh, gender neutral nursery that wouldn't break the bank. I came up with a scheme using the Little Prince, one of my sister's favorite stories and some cheery colors to make a calming yet playful nursery.
The Little Prince by Antoine St. Exupery. We wanted a gender neutral palette, and I won the changing table so we developed a room around those factors.
Modern and fresh
The paint was freshwater by Behr: http://www.behr.com/Behr/home
Furniture was Cub Kids by Netto Collection: http://cubkids.com/
Mobile: hand made by me
Quote and mural derived from The Little Prince: http://en.wikipedia.org/wiki/The_Little_Prince
Shelf, side table, lamp shade from Ikea: http://www.ikea.com/
Bedding was Mod Dot by Skip Hop: http://www.skiphop.com/
I am partial to the mobile, something I made specifically for Claire. I used sticks from our family cabin in Tahoe, and felted the birds.
Keep in mind the nursery is just as much for the parents as it is for the nursery--if not moreso. Go with something that feels calming to you, and don't be afraid of a little color! You can still achieve a serene look using bold colors.