A replica of the Windows 95 start button. The STL model is 16 cm in the wide dimension and about 6.4 cm in the other.

The black parts of the icon are 0.4 mm higher than the colored parts. I printed most of it with gray filament, switched to black filament for the last couple layers, and then painted the colors on. Turning on the "ironing" setting if your slicer has one will produce a better finish.

You might be able to print inlays for the colored bits and glue them on, so I've included STLs for them. I have not tried this myself, though, so no guarantees.