Hi Nina, I have a door draft stopper that is cute. (Sorry, can't provide a picture.) It is the simple tube design. It has a kitty head stuffed with cotton in the middle. Each end has different fabric that matches the head that looks like paws.
This design could be adopted to make cats, dogs, pigs, cows, etc. what ever head shape and color you can think of.
The tube is filled with kitty litter. You could make some with and some without the kitty litter and maybe filled on the stop when they are bought (for a bazarre). Some may want different colors to match their home color schemes.
You might to have the members submit their preference for colors, theme, even including their name. I wouldn't want to go to all the work and end up with some that were not wanted because of the fabric or color. So I would do a survey.
You could add a little skirt around the center section to jazz it up. I've seen some with a long ribbon that allows you to hand it on the door handle.
Good luck with this project and keep us updated on your status.
Pam M