Know this is an older post,

But what we use is reflective material, cut to the shape of a rectangle then with little rectangle inserts they're placed in and into the side of the runway. No mistaking if for a parking lot, and they REALLY light up the edge during dusk and at night. Pictured below is just a simple shot from a flash on a camera, and as you can see they light up quite well.

http://imgur.com/hPG4NxL


http://imgur.com/ouOmmvF

I use corrugated white lexan, like the kind used on skylights found at Lowes/Home Depot, cut it into about 2" wide strips 36" long, wrap reflective tape around the ends of two of them sandwiched together, use a post hole digger to dig an 18" deep hole, stick the non-reflective end into 18" of 2.5" PVC pipe with tape on the buried end, stick that in the ground and tamp dirt around it, secure the thus fabricated reflector with 18" of pool noodle split lengthwise on each side of the lexan. If you run over the lexan, it just bends over. Around here in Oklahoma, the winds eventually crack the lexan in a couple years, so the pool noodle and pvc pipe make it about a 30 second replacement job. I'll try to send a picture this PM when I get home from work.

Keep the strip cut a few inches shorter then the surrounding grass and tell your neighbors what that means. Everything thing else gets run over by snow machines, tractors, or errant airplanes - or pushed over by Moose (or cows maybe in your case).

I used 18" white traffic cones and blue traffic cones for the ends. Got them through Acklands grainger. I also have the bright portal runway lights, I mounted the lights on steel stakes and push them through the center hole of cones. Holds the lights nice at about 18" high and keeps the cones from moving.

Here's a picture of a rwy marker; the text description is a little wrong - it's 3" PVC.

I don't have any photos and i'm 2000 miles from home, but I used some wore out 18" disc from a field (ag) disc.
Painted them white, then hit them with a coat of the reflective paint. Set them on the ground down each side and on the ends, can see them easily and mow or run the swather over them no problem, animals won't carry them off, nor will the wind blow them away, and if you do run over one, they don't move, if you wanted to get real fancy you could glue those solar lights made for runways right to the top of them.