Tired of the colors and design of the UI already ?
Want the iconic FF blue and white border design?
Feel like achievements should give UI design customization and more!?

Then my idea is just for you!
(Something like in Chrono Cross !)

Wouldn't be awsome if, when completing certain achivements you'd get a different UI "style" you could chose to display?

Here are some ideas:
Completing GC hunting log rewards you with iconic GC colored UI (ex:Maelstrom = Red & Black).
Beating Crystal Tower gives you a "crystaly" colored UI.
Finishing certain "chain" quests gives you the iconic blue and white FF style UI.

These are just examples and i'm sure the DEV and YOU guys can come up with more!

Like if you support this idea! Maybe it will go all the way up to Yoshi-P!