I'm not sure if it qualifies as "full frills", but it felt pretty damn time-consuming.
I was an active at UCLA in the early aughts (is that what we're calling them now? I can't remember). The decorations on most of the days were pretty over-the-top, but in retrospect seem super homemade. We did a lot of the Stumps party supply stuff, or homemade stuff that looked a lot like Stumps stuff. If you are not familiar with Stumps, it's basically a bunch of giant cardboard decor like this:
and this:
For slideshow day, we spent HOURS AND HOURS covering all the walls in one of our rooms with a billion double-sticky mounting squares and 8-foot high rolls of heavy black paper. For this day, we also had a 10ish minute, fully choreographed dance number that we (and I mean EVERYONE in the house) performed along the sides of the walls while the PNMs watched our slideshow. We typically re-wrote the lyrics to 4 or 5 songs and sang them while we did our little dance moves. It's been more than 10 years since I've been an active, and I'm pretty sure that I can still do some of those songs, singing and dancing, in their entirety.
For other days, I recall filling so many helium balloons that the entire ceiling was completely covered, renting lots of live trees to fill the house one of the days, wearing 100% matching outfits, etc. We were, however, limited to water with only some garnish (lemon, lime, etc.) for most days. Pref we could give some kind of sparkling beverage.