I made a simple kitchen butter holder. I wondered how come nobody designed one... I'll probably do some adjustments to the top cover for better grip, but it works just fine. The butter we are using comes in somehow standard packaging of 10x8x4cm - fits nicely into the box. If you need cover for different butter size, I provided the source sketchup file.

UPDATE: I made the corners a bit more round and enhanced the top handle, too. I had to re-print it, but it takes 5 hours on my slow printer...