Mug/Beer coaster with the brand new logo of a company I work for: https://nozbe.com
Print with translucent purple PETG for best results. Purple because purple is cool. PETG because coffee is hot.
There are two separate STLs because to get the effect of nice gradient when looking at the coaster through the light you have to put 90% infill on the logo (but the rest of the coaster can be printed with 20% infill for efficiency)