Before you get too excited, you should know that it's the key hanger, not the painted slate. I have some crafting ability, but come on, that's a pretty amazing Block O... definitely outside of my talent level.
Nonetheless, I'm still pretty excited about the key hanger. It was super-easy to make! I started with an unpainted 1x4 (this one happens to be 18in long.) I marked out where I wanted my hooks to go. This board has four hooks.
Then, I applied tile pieces mosaic style. I started with 8x10" tile sheets from Hobby Lobby (roughly $7 a sheet) and snipped them into small pieces. Two notes on this:
1. Put newspaper down before you start snipping. The tile pieces tend to make thousands of shards.
2. I like to have everything in order and in clear patterns. I started with that in mind, but I threw it out the window. I had to keep telling myself that mosaics are supposed to be asymmetrical. As soon as I got the swing of it, I did fine for my first project like this.
As I cut pieces, I laid them on my board. I got everything laid out how I wanted it, leaving my hook marks uncovered, and then I used craft glue to glue the tile down. I let the pieces dry over night, and then I mortared around them. The mortar was part of a kit I got ages ago, so I don't know how much it cost, but you could easily use plaster of paris to fill in the cracks, which is very affordable.
After the mortar dried, I scraped it off the tile pieces, leaving just the cracks filled. I put two picture hangers on the back, and voila!