Broken arrows are great for yardage markers.Stick them in the ground at 10-20 yard distances in different locations.Really takes the guess work out of the range when the time comes to let one fly.
Also as yardage markers,if the nocks are still good and you use attracting scents,stick a cotton ball or gun cleaning swab in the nock with your favorite scent,works great.
I am sure you will hear alot more ideas

P.S---also makes great tomato stakes for the garden[&:]