I know how I would make them, but I never have. I may this year. From one 10' piece of PVC, you can get two corn stalks.
roll of construction protective paper (Home depot $12)
clear school glue
Latex paint to tint the glue the desired color.
Plastic water bottles (the ones that are ear of corn sized)
Wire coat hangers or ceiling hanger wire (CHW is from Home depot)
Definitly get the corn fabric to put up on the walls, then make two or three rows of fake corn to go in front.
Cut the PVC to length
Roll out and cut the paper into pieces 3' wide (comes that way on the roll) and 20" long
stack a bunch of the paper together so you can cut many leaves at once
cut into the 3" wide strips
then cut each strip into the long leaf shape of a corn leaf leaving a long tag to attach it to the stalk
Corn is aranged a certain way leaf placement will really sell it
attach two leaves directly opposite each other about two foot up from the bottom
about 10-12" up from that attach another two leaves but on the two sides opposite the first set
Attach alternating sets of leaves by (taping the tag to the stalk, leaf flat against the stalk pointing up) all the way up. shorten the space between leaf sets by two inches each time as you travel up the stalk
So on a five foot stalk you would put the first one 2'up, then another 12" from that, then another 8" up from that then another set at the top, so about 8 leaves per stalk
to keep them organic looking, vary the lengths of stalks and leaves
Run the hot glue along the shaft and along the underside of the leaf, run three or four strips along the underside of the leaf (the side now facing up). Stop the glue about half way down the leaf. the glue is there for structural support. once they are glued you can stand the corn stalk up right and curl the leaves back
For ears- tape a length of wire to the water bottle, then tape a few leaves to the wire so the fold up over the bottle, a hole can be drilled in the stalk that the wire slips into. I would have an "ear" on every other stalk.
the whole thing then gets painted with the glue mix, to finish it off- stuff the top of the PVC with a piece of fake plant that looks like the tuft on top. Buy a fake plant that will give you many tufts so its more economical.
I think the finished cost would be about 3-4$
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What I do Stiltbeaststudios.com