I'm a big fan of Jello as an art form for potlucks and baby showers and such, will make it if I have a suitable sized group often including a fancy pattern or flowers or whatever. Unfortunately, all my favorite recipes make a lot, 12 servings or more so I don't make them for home often especially now with the hubby keto and the son vegan.
I have seen some pretty things at buffets and such but had a lot of fun looking at advanced ones.
As fancy as I've gotten myself is when my son was young and I would take blue jello and the miniature Swedisn fish candies and stick a few in the jello... I thought it was quite the meal with a hot dog octopus -- but he didn't appreciate hot dogs either. He did like the boxed Kraft mac and cheese I put the hot dogs on just fine...
https://www.wikihow.com/Make-a-Hot-Dog-Octopus