When I moved into a new apartment, I started looking for something to fill up a blank wall. Searching around the site, I was inspired by kiwisaft's Instructable "Megaposter Curtain" to make a multi panel piece of artwork that would fill up my wall.
I didn't want to have any visible means of support, so I decided to use magnets instead.
Step 1: Materials
1] An image- It needs to be high resolution, or in a format easily enlarged without loss of quality.
2] Masonite- The amount you'll need depends on the size and number of the individual panels.
3] Spray adhesive- I know, I know, aerosol is bad...
4] Small metal washers- Something magnets can get a hold of.
5] Small rare earth magnets- I used 3/8" x 1/16" round nickel plated neodymium magnets, you might go a little bigger depending on the size of your panels.
6] Small level- To make sure nothing is crooked
7] Chalk line, or high tech equivalent- To ensure your panels are all evenly spaced.
8] Thumbtacks- If at all possible, get flat head thumbtacks so the magnets will stick better.
9] Chalk- To mark your wall
10] Glue- Something that will hold a magnet to the back of your Masonite. I used Gorilla Glue, but it expands quite a bit, so I don't really recommend it.
11] Tape Measure- To lay out your wall.
Xacto/paper cutter- To trim up your printed images, depending on the size and whether or not you printed bleeds. If you use a print company like Kinko's, you could have them do the trim work, but they'll probably charge you for it.