If you're wanting scenery blocks you could use 4x4s and landscaping fabric. I prefer Preen brand. I use it in the front of the yard to separate the grave yard from the walk through. My 4x4s are in the ground about 18-24 inches, I use a staple gun to attach the fabric and then use a 1x2 with screws to further secure it. The wind will not rip it off that way. You could use 2x4s to cut cost.