Background image tiling

I got sick of beautiful tiled patterns behind blog post code but not in my terminal.

As a bonus, it seems to reduce eye strain, but you'll have to see it to believe it.

Light Colored Pattern:
![terminal-noise-light](https://f.cloud.github.com/assets/1735/84730/7247ad5c-6421-11e2-8b45-49f074123dc3.png)

Dark Colored Pattern:
![terminal-noise-dark](https://f.cloud.github.com/assets/1735/84732/e47cb14c-6421-11e2-95db-da88267e64e6.png)