I bought an old wooden dresser at a garage sale for five bucks, painted it red and mounted a large set of casters on the bottom. It looked just like a rolling tool cabinet. My son loved it.
I did the same for my son's room. Bought some aluminium angle at Home Depot for the corners and just used a flat piece at the top of each drawer to look like chrome handles. I put a small buffing wheel in my drill press to polish all the trim. Also did his bed to match, along with a set of shelves on his wall. I mounted a couple of cheapo wrenches I picked up on clearance at TSC on the footboard of his bed.
You can see the shelves in this pic
Here are the wrenches on his footboard. Where the tire/wheel is, was originally a spoked wagon wheel looking thing. I just covered it with 1/4 plywood and painted the racing wheel/tire. I used hex head sheet metal screws for the bead lock look around the rim.
His matching headboard
His whole room is a racing theme. It is painted with white/yellow/blue stripes around the whole room to match his favorite drivers car. I mounted some wrenches on the wall, and used checkered flag tape from Advance Auto to do the ceiling fan and light switches. the logo's of all the local dirt tracks we go to are around the top border. He loves it.
More pics are on my photobucket here :
http://s281.photobucket.com/albums/kk212/boro_boy70/Bretts room-tool boards/