Background colour for advertisement MPUs

### Before

![screen shot 2014-10-13 at 12 59 26](https://cloud.githubusercontent.com/assets/74132/4612994/7153b4c8-52d0-11e4-8a63-4f23c308fa49.png)

### After

![screen shot 2014-10-13 at 12 59 16](https://cloud.githubusercontent.com/assets/74132/4612996/7538c8e4-52d0-11e4-97d4-500eef8475c6.png)