As seen on ikeahackers.net
You will need one table from IKEA, check if you can find a super deal for half price in "as is section".
Then you will need some tools.
Step 1: The tools you need
A saw to split in half the table top.
a jigg to bend the brackets.
a drill to drill the brackets and the wall
a screw driver
a lot of helping tools devices and appliances check the photo to have an idea!It's a mess!
Step 2: Chopping and bending!
You have to make the L brackets fitting between the sandwich boards of the table top.
and dont forget to make 2 holes in each bracket for mount them on the wall.