Have you created anything "home-made" for your plane? (or a low cost alternative?)

I was wondering if anyone reading this thread would share information
on any devices that are perhaps homemade or are low cost alternatives
to items available in aviation catalogs.

Wheel Chocks. Go to your local hardware store and purchase a three-foot
length of whatever size angle iron you find sufficient. Cut into 8-inch
lengthes. Paint them a bright color, attach red ribbon and bungie cord.
Stow them in the baggage compartment or under the pilot seat for easy
access.

Do you use grass airstrips? Are you going to AirVenture?
Cut three 1-foot x 1-foot squares of marine plywood (not particle board)
of one-inch thickness. Stop just short of where you park the airplane.
Climb out, pull out the boards, place them ahead of each wheel. With
help, pull the airplanes wheels onto the plywood. When you are ready to
leave, pull the airplane off the plywood and stow them away for the next
use. This prevents yours wheels form sinking into the ground and
requiring high engine power to pull the airplane free from the ruts.
Montblanc may be selling them at the R.A.P gathering this summer at
AirVenture.