My girlfriend is always leaving knives around on the counter. I have a habbit of finding accidents waiting to happen. I thought I'd do us both a favour and build a knife block before the xmas turkey needs carving, something that was going to be well easy to use and not take up any space on our limited counter top.
wall screws | Magnets from old harddrives | piece of wood | knives = wall mounted magentic knife block
Open up some old harddrives, you'll need the pair of magnets from each drive for every 1.5" of knife block. Dispose of harddrive wastage responsibly.
Mortice out the back of the knife block, to 1/4" from the block face.
I hung it with 2 screws, the screw head hooks were washers till I went at them with a hacksaw. Glue in place. Tip: use a sheet of paper against the back of the block and mark where the screws need to go, then place the paper against the wall and use a level for once.
Do not put up in an earthquake prone area, keep out of the reach of children, etc etc.