Updated Custom Tiles web app! With the beta or v1.0 or whatever, it was hard to line the text up well to really look like it fit on your home screen. Now though, you can use HTML entities which are basically just a big collection of different icons. You can see here what you can make tiles look like now in the sample.
So get on over to my Custom Tiles web app which is linked below and get to creating some beautiful tiles for your device.