1- 7 unneeded CD's
2- Hot glue or super glue
1- Just copy the pictures included. Try to make sure the outer edge of each CD touches the edge of the inner circle on each other CD. (it's hard to explain, but if you examine the picture(s), you should understand)
2- Hang it up using 2 or more nails in the inner circle.
3- Enjoy this extremely impractical, but cool looking mirror/decoration.
Ideas- You may expand it as much as you want. In other words, just glue more CD's to it in this fashion. It can be any shape you want. Large rectangles look good (i know by experience), and larger circles are fine. Have fun making your own :D