On a slightly more serious note, i think multiuser interactive stuff is always fun.
Purely cosmetic
Can always be fun. Players already seem to like interactive stuff. Of course, these things should only be usable in non-PVP areas. but can always be fun. Players already seem to like interactive stuff. Of course, these things should only be usable in non-PVP areas.
Popup bar: deploy a bar with 3 stools that players can sit on with the item owner being the bartender (random ganis to show drinking, bartender polishing bar, serving drinks etc)
DJ Booth: deploy a DJ and maybe a mini dancepad which players can choose to interact with
Cosmetic Duels: Allows you to challenge a player to a friendly gani-based duel. Random choose sword fighting, pistols and maybe just slapping. Server determines a winner and sets each player winning/losing animation.
Deployable Table / Picnic Blanket: Just drops a 4 seat table you can click to sit on. Could show random animations (passing food, taking a drink etc).
Bit more fitting of VIP status
Getaways: Monthly thing but perhaps every month, VIP members can warp to a specially created area to view. Maybe sneak previews, maybe something silly. Just something.
Far more interactive (maybe not VIP material?)
Two person vehicle where players each control one side of the vehicle aka left and right (alternating to move forward). Need to work together to get anywhere (think of those two-people swan boats). Added benefit: can have races with this kind of thing.
If I was still working there, this is the kind of stuff I prob would have put in that Events Shop. I never was truly on board with the VIP stuff :|
[Edit]: Apologies if any of this stuff has actually been done... i haven't exactly been active for a few years. Just stuff off top of my head!