Hang small things on a metal wall by attaching magnets to them.
+ reduce amount of holes in your wall
+ rearrange, take away or put some more tools on the wall without destroying your wall
+ clear view of your tools
Metallic things like scissors or metal boxes can hang directly on big magnets.
Attach thin magnets to plastic boxes or clothespins with double sided adhesive tape.
Hang non magnetic things on magnets with pins.
Keep in mind, that various devices have a sensitivity to static magnetic fields of permanent magnets (they could be disturb temporarily or be damaged permanently), so keep save distance between those and the magnetic wall.