I've seen Daylily flowers used as a substitute for those tissue-paper thin squash blossoms.
Mom R.I.P. - would take some of the freshly picked squash blossoms, dip them in egg-wash, dust them in flour and fry them up three or four at a time, like a small pattie, in some light veg. oil. Since these delicate blossoms are seasonal, it was my all-time favorite, summer lunch. Eaten warm, sprinkled with a little salt and pepper...the best!
Mom was always in the kitchen back in those long gone, 1950s days. Squash blossoms were sold in all Italian markets, and were dirt cheap. But all the new "gourmets" on TV made squash blossoms popular -and so now, they cost big money. They did the same thing with popularizing skirt steaks, which were considered junk meat, years ago. Now, it cost more than filet mignon. But char-broiled, I'd take a skirt steak over any rubbery-bloody filet mignon or the always-shoe-leathery, London Broil.