I'll prob get a bit of flack for this, but check out the craft section at your local wal-mart. Ours just expanded and has a lot of great items that are inexpensive and great for basics. Any thing more elaborate I hit up my local Joanns, Hancocks or Hobby Lobby.
Mt first project was a couple basic pillowcases. They were easy to make (and easy to take apart when something went wrong) This also gives you the opportunity to play with the different designs on your machine without having to worry about ruining your project. Just hit up wal-mart for some clearance fabric that semi-coordinates with your room and have at it.