I love rugs with large polka dots in a nursery. See the below photo (after the jump) from Living Etc. Magazine, but that rug is from The Rug Company and costs mucho mula. The above rug is from the Pottery Barn and it's on sale!
Find the red dot rug (8 x 10) for $399. Also available with yellow dots, which is not on sale, but still a great deal. The 8 x 10 is $599.
The below nursery is from Living Etc. Magazine and was designed by Sixx Designs. Definitely droolworthy!