Take a few bottles and cast them and make hundreds out of polyurethane or epoxy resin. So they are solid, can be tinted to be browns and greens or left amber and clear. Something very substantial like a bolt can be cast into the end so they mount into the walls and can not be tugged free. Many you only need to see the back 2 inches in depth, some side views might actually only be half cast of a bottle. Ones in the distance can be something cheaper like plaster, ultrical, painted with lots of cob webs to blurr the display. Lots of dust.
Another fabulous post from the U.S.Department of Wild Imaginings, now in spectaclar stereo, sponsored by the Adhesives and Sealants Council, suggesting ways to stick things together since the 1800s. Not fabulous in a gay way. Your results may vary. Illinois residents add 8% sales tax. These posts have been made by professional post makers, do not try this type of posting on your own without extensive training, lovely assistants and a trusty clown horn.