We needed some signs for our makerspace so we took a turn at designing our own "Whichever/Whatever" bathroom signs. They are printed in PLA with a single extruder; we used the M600 gCode at the appropriate layers to change the filament color and achieve the tri-color seen in the pictures.
We used double-sided tape to adhere the signs to the bathroom doors.
Prusa and MatterHackers PLA
Blue, Silver, Green, and Purple