Style On a Shoestring I believe the bedding was purchased Pottery Barn Teen but it has been a couple of years now that the room has been done. I doubt it will be available at this time but it's a good place to look for options.
Anne DeCocco I think 8" would give you that nice chunky look. Adding the smaller stripe below gives it more presence. Lots of personality with a simple project!
Teen Room: Here is a link to an etsy store that will create similar custom wall letters. http://www.etsy.com/listing/62082444/big-metal-letter-initial-monogram