"Due to fire code regulations many props artistans build plywood boxes and cover them with bar sipp straws and drinking straws then paint them to get the needed effect. It worked on Hee Haw and see how many straw sets they had."

"If it's the actual hay someone is allergic to, then there's really nothing you can do but use some other material. However, if it's the dust, mites, and other debris that exude from the hay, perhaps spraying them with polyurethane…"

"raffia=great idea!"

"You might also attach some raffia to the bale to make it have more dimension. It can be found in both natural and synthetic materials. I have made bales for a ground row before with hay. I base painted and textured the boxes first then sprayed it…"

"I've seen boxes covered in canvas painted to look like hay. Not realistic but effective."