Materia dropped randomly from END GAME DUNGEON bosses.

Materia like that of FF7

Double Hit Materia - procs double hit at a rate of 3% (Adjust as necessary).

Absorb HP/TP/MP - procs similarly.

Double Cast Materia - procs spell to be casted twice.

Gil Finder Materia - 5% increase to all gil received.

I can continue with every single materia ever created in FF7.

This is a great idea to make the materia system more fun and would make the game that much more awesome.

Also I noticed these suggestions have been taken quite the attention from SE, you're using the community base as free consulting to bring in revenues! So for using my idea how about a payment to me?

Further discussion in PMs