IKEA makes some nice and decidedly not plain square mirrors named "Hönefoss." They're hexagonal in shape and come in a box of 10 for $15 (5 each of two different hues of brown). You can read all about them on IKEA's site: http://www.ikea.com/us/en/catalog/products/60182059/
The mirrors look pretty great on their own, but simply sticking a bunch of mirrors on the wall felt a little bit more appropriate to a dorm room than a home -- so I devised a plan to add a little 'punch' and 'pop' to the mirrors by raising them off the flat wall in two levels of depth.
Here's a quick overview of the project:
Tools & Materials used:
Let's get started...
For this project, I determined that I wanted two varying depths of wood: 1/2" and 1". Naturally, MDF is a great option for this use and panels are available in those depths. Specifically, I chose "Ultralight" MDF since it is about 1/2 the weight of regular MDF (which can be quite heavy). If you're not familiar with MDF, you can learn more about it on Wikipedia.
Starting with 360 degrees (the degrees of a complete circle), then divide by the number of sides in your object. From that, you'll get the degree of the object's angles. Divide by 2 to get the miter. you'll get your angles, divide by 2 to get the miter.