This Addon plays Illidan's "Wait, I have an Idea!" upon using one of your major class/spec cooldowns.
Current List is as Follows:
DK- Icebond Fort, Unholy Frenzy, Pillar of Frost
Druid- Berserk, Survival Instincts, Celestial Alignment, Tree of Life
Hunter- Rapid Fire
Mage- Icy Veins, Combustion, (Mirror Image? commented out atm)
Monk- Life Cocoon, Avert Harm, Xuen
Paladin- Ardent Defender, Divine Favor, Guardian of Ancient Kings (ret only)
Priest- Lightwell, Dispersion, Power Word Barrier
Rogue- Adren Rush, Vendetta, Shadow Dance
Shaman- Feral Spirit, Mana Tide Totem,
Warlock- Unending Resolve
Warrior- Shield Wall
I'm not completely satisfied with this one in its current state, but I am uploading it, as is, in case someone might want to use it now. Lemme know if there's something else you feel appropriate, or if some spell is a little too spammy for this one.
I will be combing over the list of Spells again, soon.
I will be inevitably changing the list of spells in 6.0, the Warlords pre-patch, as many spells will be changed/removed.
It is set to play with Master sound, so it will still fire and be heard, even if you keep your "Sounds" turned off in game, as I sometimes do. As long as your "Master Sound" is set high enough, it will still be loud enough to hear.
I am also working on a couple other projects at the moment, so keep your eyes peeled.