Here's some additional ideas for nursery themes:
Or you might want to go with a particular designer of crib bedding and use the colors for your room ~ like I did. Here's some great crib bedding designers you might want to check out.
You might also go with a type of style, like modern baby bedding, with bold patterns and colors or classic themes, like plain pink for girls or blue for boys.
No matter what you choose to use as your basis for your nursery theme remember to have fun!