Tray for storing Mini printer tests as Swatches

I have been using the Mini All-in-one Printer Test as color swatches for my filament.  I created this to keep them organized.  

I wanted something that was simple and did not use too much filament.  I also wanted the lines to match the test prints, and remain simple because I wanted the focus to be on the swatches, not the container they are in.

The tray holds 20 test prints.