Here's a sign for the fictitious Aperture Laboratories from the classic Portal and Portal 2 video games. I hung one up at work, and pretty quickly found out who my fellow video game nerds were.

I've included 3 different plates to choose from:

1. Just the sign, no cutouts
2. Cutouts on the back for 8x2mm magnets
3. Cutouts on the back for 6x2mm magnets

The border around the sign is a separate object, so if you like it better without it's easy to delete (See 2nd picture).

And remember:

The cake is a lie…