One could argue that all diamonds are just very pretty pebbles.
The wallpaper version is available at the preceding link.
Today's Gratitude Item: Managing to coax some information out of the school database for a colleague. She needed the information so that we can get funding for the Numeracy program we are running and could not get the database to put student's tutor teachers next to the standard "Name" / "DOB" / "Ethnicity" information. After playing around for about 20 minutes I figured out how to do it. Said colleague is very computer literate and getting the database to cooperate was quite a challenge :)