Grass markers
I use white 5 gallon plastic buckets. I have 8 inch tall black stickon numbers. The buckets are two hundred feet apart. If you see 14 on a bucket it means 1400 feet remaining. To the point of DanH about runway end markers I agree. I have four buckets per side at the threashold to make it stand out. Under each bucket is a white painted concrete pad incase I move the buckets for repainting or mowing. If someone hits a bucket, which they have, it just bounces off the plane into my hayfield. Never had damage to a plane and they seldom blow around in the wind. Best part, the buckets were free. I considered solar powered lights, in fact I have them in storage in my hangar, I decided against encouraging night flight into my strip. We have mountains close by.