I've been working on this mirror for months. Literally, once a month for the last 5 months, I've been trying to get this project done. I enlisted the help of my expert-woodworking father and utilized some of the Tuesday morning time I get free of Griffin thanks to my dad's lovely wife Signe:). I saw this done on Bower Power as a part of the Pinterest Challenge and she gives great instructions and here is a much more in-depth tutorial from Kristi at Addicted 2 Decorating.
I'm still getting the hang of writing/picturing through a project and therefore forgot to get any before pics. But here are some of the materials I started with:
-wood stain (Jacobean)
-string and pencil (for tracing circles to cut)
-wood glue brush
-picture hanging kit
-various saws from my dad's woodworking garage stall
First we (my dad and I) started by cutting all of the cedar shims into 2 1/2 inch strips, that way when you arrange them in the basket-weave pattern, the width of two shims is the same as the length of a shim. Then I just started gluing them down. This part took about 2 hour-long installments.
Then I set it up for some staining. I gave it a good, dark stain (Jacobean). One caution is to be careful not to get any wood glue where you are going to stain, because the stain won't stick to the glue. Using a dark color was a good idea, since it is tough to get the stain into the small cracks and even harder to wipe off the excess. If you used a lighter stain, it might look darker between the shims.