Trinkets for MGP

One thing I'd really love to see more of is an expansion of the kinds of sillier effects and things- consumable fireworks and prisms and the like from events are all well and good, even though I do really like the suggestion that you can use a sufficient amount of them in order to permanently learn that effect as an emote.

I'd love for more of that specific thing to get put up in the gold saucer, available for MGP- coming up close to running into the MGP cap I find myself wanting for a decent sink to throw some in on, and having some MGP-specific fireworks or even more outlandish effects a-la WoW's toy box system (albeit only usable in major cities) would be a fun thing to throw in to keep people invested after the mount grinds or if they're not interested in the big prizes like Fenrir.

Stuff along the lines of temporary visual aura effects like monk's greased lightning or dark knight's old Darkside aura, or the ability to turn yourself into a frog or a chocobo for 30 seconds, things like that you can throw out in specifically non-combat zones. Throw the Job Mastery prisms in there for when mog tome events aren't currently ongoing.

The ideal would be as an extension of the fashion accessory system so that they'd be permanent unlocks, but for it to continually function as an MGP sink they'd need to be consumable. Alternatively, make them tradable/able to be put on the market board for people with more gil than MGP?

Thoughts for what other effects they could add?

Even if they weren't permanent unlocks I'd be down for this.
I kinda hoard my consumable fireworks and prisms cuz you can't get some of them again and what if I need some for a cool gpose idea.
I think anything close to what you're proposing would be excellent.