This DIY magnetic key holder is an original design by South Korean blogger Hobby Design. The giant wooden key-shaped plank looks pretty simple, but what's cool about it is that it conceals little magnets in its center layer that allows keys to stick to the plank. The key holder itself can stick to your magnetic fridge doors or office table side -- no drilling, hooks or nails necessary.
What the blogger does is use two pieces of wood and essentially, sandwiches thin magnet pieces in between the two. The wood planks on each side are thin enough that the strong magnets are still effective, even when they aren't visible from. The shape of the design is cute because refers to its function, while the practicality of it is impressively convenient to use.