I just finished a layout using grunge board numbers. BIG ones! Last summer my boys were 14 years old. I did this layout of Duncan in/at/on the Moberly River; right where it comes in to the Peace.
Grungeboard is a lot of fun to play with. You can ink it, paint it, rough it up, glue stuff to it...
The numbers I had were already embossed with the swirl pattern. I rubbed black distress ink over them both to bring out the swirls and then coated each number with black distress stickles so they are a little rough and sparkly.
PS: did you notice I used 4 different 2" x 3" photos on this layout. If you want to know how to get all 4 printed onto one 4x6 photo check out my tutorial a couple posts below.