Doorknob Hangers
Material:

Foam doorknob cutouts found at crafts stores
Foam shapes
Directions:

1. Apply shapes in various places with different themes in mind.


Bugs for "don't bug me"

Halloween themes with ghosts and gobleins, cats and pumpkins with "enter at own risk"

For the dinosaur or wild animal lovers you can use the same caption with animal cutouts.

Another caption might be "protected by the beast"

For a summer theme use flowers and butterflies with a "welcome" caption.