I really do like the G3s. I think they can be slightly underrated with collectors. This may well be because there were so many different characters available at one time, and there was some buying fatigue (we didn't know when we were well off). It may be due to the repetitions of pink, purple, and white (although other colours were also used quite a lot). It may be that the initial joy wore off after a few years. They have their own sparkly charm that (so far) hasn't been repeated in the MLP line.
These top two shelves are tropically-themed ponies (a big thing in G3) and nature-themed ponies. (largely flowers and butterflies). I've also got some G3 smalls displayed on these shelves. While cataloging some playsets I remembered how much I loved some of these accessories and decided to take the chance on displaying them out like this. There's always the possibility that they could be knocked down and go missing, but as the Cave is kept closed, there is only a small chance that they'll actually disappear.
The next two shelves are, for want of a better term, culturally-themed ponies. These are the ponies with artistic temperaments, those who like a day at the spa, those who enjoy a ride in a hot air balloon, and other similar hobbies. Essentially, they're the ponies that don't fit into any of the other categories. Also, another street in Ponyville, with the dance studio, salon, and boutique. Everything a cultured pony could need for an enjoyable evening out.
Finally, there is the Breezie hideaway and the Celebration Castle. The Twist & Style Petal Parlour is an interesting playset. Designed as a display space for the tiny Breezies, it doubles as hair styling gimmick for the regular sized G3s (although it works best with the Super Long Hair ponies). It's got a lovely design, and I feel as though it's an indication of what was to come in G4 with the very 2 dimensional playsets that function better as a display space than an actual play space.
The Celebration Castle, on the other hand, hearkens back to the G1 era. This beautiful castle displays nicely from either side, but opens wide to reveal a good sized play area. This was one of the first G3 pieces I bought, and I was really excited about it. I love the detail on this (and all the G3 playsets), and the elevator just amuses me. All the royalty-themed ponies live around the castle, but not all of the G3s are princesses in this collection.
And that's the G3 section done and dusted (but not dusted lately). Next time, look up...waaaay up.
Elf