Saw this idea on Pinterest and HAD to make it!!  It turned out super cute, perfect for my family room wall and only cost me $9!! It was really easy and took me less than 30 minutes to make.
Here’s what you need:
9 mirrors from the dollar store.  (some have designs on the frames, I picked ones that are more plain)
Black Duct tape
cardboard

So what you want to do is take 3 mirrors and tape them securely together.  Don’t be afraid to use too much tape.

Do the same thing for a second row and then tape the two rows together.

Then tape one more row together and add it to the other two.

Now it’s time to add the cardboard for stability.  I had a small box that was collapsed so I taped the whole thing on for extra stability.  Again, tape is your friend.

don’t worry if your box doesnt’ reach all the ends- it’s most important that it covers as much of the connection points as possible.

Time to hang up!