Don't get locked out of your house! Put spare keys in a rock and toss into your garden!
Surprisingly, there are no hidden key rocks on Thingiverse or anywhere else, so I decided to make a few. I found a few random rock 3d files, converted them and put holes in the bottom. One of the rocks is from chaparja44 here: https://www.thingiverse.com/thing:584629
You have four different types of rocks to choose from.
These things hold your standard house keys or two (or more). I didn't design a lid for them because we all know, not one single 3d printed lid ever fits right in any project. Just put the key in the fake rock and plug the hole up with whatever you desire.
Paint as you wish or use whatever color filament. Enjoy!