Did you switch your materia around and exchange it between characters, or did you keep certain materia on certain characters?
I like to keep my characters with certain materia. Voila, here is what I have so far (if anyone is interested):
(SPOILER)
Cloud:
Green Materia:
Earth : Quake, Quake2, Quake3
Ultima
Red Materia:
Titan
Bahamut
Neo-Bahamut
Yellow Materia:
Deathblow
Purple Materia:
Cover
Counter Attack
Pre-Emptive
HP Plus
Barret
Green Materia:
Poison: Bio, Bio2, Bio3
Lightning: Bolt, Bolt2, Bolt3
Destruct: DeBarrier, DeSpell, Death
Red Materia:
Ramuh
Purple Materia:
HP Plus
Blue Materia
Added Effect: Poison (weapon)
Elemental: Lightning (armor)
Added Cut: Ramuh
Tifa:
Green Materia:
Ice: Ice, Ice2, Ice3
Revive: Life, Life2
Barrier: Barrier, MBarrier, Reflect, Wall
Restore: Cure, Cure2, Regen, Cure3
Contain: Freeze (Break, Tornado, Flare - Haven't leveled up yet)
Red Materia:
Shiva
Yellow Materia:
Sense
Purple Materia
MP Plus
Blue Materia:
All: Restore
All: Barrier
Quadra Magic: Contain
Red XIII
Green Materia:
Fire: Fire, Fire2, Fire3
Time: Haste, Sow, Stop
Red Materia:
Ifrit
Phoenix
Yellow Materia:
Enemy Skill
Sense
Blue Materia:
All: Time
HP Absorb: Fire
Cait Sith
Green Materia:
Transform: Mini, Toad
Mystify: Confu, Bersek
Seal: Sleepel, Silence
Comet: Comet, Comet2
Red Materia:
Choco/Mog
Yellow Materia:
Enemy Skill
Manipulate
Morph
Blue Materia:
All: Seal
Yuffie
Green Materia:
Poison: Bio, Bio2, Bio3
Exit: Escape, Remove
Heal: Poisona, Esuna
Ice: Ice, Ic2, Ice3
Red Materia:
Leviathan
Yellow Materia:
Throw: Throw, Coin
Steal: Steal, Mug
Purple Materia:
Chocobo Lure
Speed Plus
Blue Materia:
Elemental: Ice (armor)
Cid
Green Materia:
Earth: Quake, Quake2, Quake3
Seal: Sleepel, Silence
Fire: Fire, Fire2, Fire3
Transform: Mini, Toad
Red Materia:
Kjata
Yellow Materia:
Deathblow
Purple Materia:
Pre-Emptive
Cover
Blue Materia:
All: Fire
Vincent
Green Materia:
Restore: Cure, Cure2, Regen, Cure3
Gravity: Demi, Demi2, Demi3
Heal: Poisona, Esuna (Resist- Havent leveled it up yet)
Revive: Life (Life2)
Lightning: Bolt, Bolt2, Bolt3
Red Materia:
Odin
Purple Materia:
MP Plus
Blue Materia:
MP Turbo: Gravity
All: Restore
MP Absorb: Lightning