I wanted a way to see all the different filament types and colours I've been using.  Found lots of different swatches and cases online.  Why download one when you can create your own? 

The tray holds 90 swatches.  It was printed with some economy PLA. 

The swatches have a depth gradient to be able to check transparency based on layer count, etc...  Made the swatch large enough to be able to stick a label on it without much issue.  I typically print them with 2 walls and 2 top and bottom layers and 15% infill.  I'll change that up depending on what I trying to achieve.