Knife Blocks Made of Wood
The process is interesting. First you take a block of wood and cut incisions in it the long way. Flip it over, and cut incisions on the opposite side. Cap them off with a thin piece of wood. Then, cut the one end at a 45 degree angle . Attach a second piece of 2 x 4 cut at same angle. Cut bottom at a 90 degree angle so it sits flat.
Put your knives in it.
The other is even simpler. Cut slits. Add decorative object that covers all holes add hanger on back, and mount on wall.