My roommate bought a TV wall mount, but didn't realize it was stationary, and didn't swivel. I came up with a very inexpensive way to attach it to the stucco kitchen wall, and included a small shelf for the DVD player an cable box. As you can see, all i really used were cut 2x4 pieces, several long Eye-bolts, and various blots, nuts, and washers. Under the bolt on the TV mount, you can see a washer and a thick rubber washer, which helps keep the TV stationary when moved to a different angle. The Eye-bolts have been hammered and pinched together, so the bolt doesn't slip through the opening.
The Eye-bolt is attached to the wall-board in a countersunk hole, and tightened on both sides with washers and bolts. I had to drill through the TV mount for the bolts that pass through the Eye-bolts. It's been awhile since I did this project, but I believe I used an aircraft nut on the end of the TV mount/Eye-bolt nut, so it won't loosen up over time, and allows the tension to be adjusted.