In the winter I leave orange peels on the radiators. The smell permeates the house.

I cleaned the mold off the air vents and put a bucket under the leak!

Ok but actual answers though: I got a cool calendar for the kitchen wall, I put cards and pictures up on the fridge, I give my partner 3D printer filament in fun colors and he uses it to make cute stuff (everything he makes is inherently cute, even mundane containers and tools)