i place the bottle caps on golf tees and set them around the yard where the pests usually are. it's a great way to make sure your still on target, and to test ranges.
sidewalk chalk cut into 1/4" slabs and placed on golf tees explode in color. old cherry tomatoes and grapes to place on the tees. put about 1/2" of water in small plastic "dixie" cups then freeze them. they pop out and can be placed on tees. best part is not having to clean up the pieces!
i have a 2x4x8 with holes drilled 3/4 of the way through at both ends that sits on 2 steel rods. the 2x4 is leveled by tapping on the ends and driving the rods in the ground. the top has small holes drilled for tees. i hang cans from it, paper targets, and have spinners mounted. it's also portable.
i'll post a pic when i can.