Acrylic paint in the house colors of your choice
Rotary tool or drill with a small drill bit
200-grit or higher sand paper
Find some wood to make your plugs out of.
Use the knife to strip the bark off.
Use the small saw to cut the wood to the desired length.
Use the knife to make little indentations on the ends of the wood to help guide the drill bit.
With the rotary tool or drill, drill through the wood.
Use the sand paper to sand the wood and make it smooth and pretty.
Paint your house colors on it!
If you don't want to make tunnels just skip drilling to make a fine set of plugs!
fer's tutorial was taken with permission.