"We would be honored if you would join us". It's unclear from the film if there were any napkins when Han, Leia, Chewie, and Lando had dinner with Darth Vader and Boba Fett in Cloud City.  However, eating in those masks has got to be messy, so these napkin rings might have come in handy.

There are several designs, simplified, but very roughly modeled on some of the lightsabers in Star Wars. The "GenerateLightsabers.bat" file will generate all of them in 3 different sizes. The larger it is, the easier it is to put a napkin inside of it, but it also makes it look a little short for a lightsaber. I tested these with paper napkins - cloth napkins might require scaling up. I printed these in grey ABS, and added black details with a permanent marker.

Update: I added some "dual" sabers, Darth Maul and Yoda, as well as some sets of 9 sabers for Darth Vader and Yoda. I updated the OpenSCAD file to support these, and updated the script to include them.