They are ALL either cosmetic or purely for fun. I wonder why that is...
Here are some examples of minor glyphs that actually do something:
Deathknight
glyph of tranquil grip
glyph of resilient grip
glyph of path of frost
glyph of death's embrace
glyph of death gate
glyph of corpse explosion (holy nova is a major glyph?)
glyph of army of the dead
Druid
glyph of the stag
glyph of the predator
glyph of grace
glyph of aquatic form
Hunter
glyph of tame beast
glyph of revive pet
glyph of aspect of the pack
glyph of aspect of the beast
Mage
glyph of rapid teleportation
glyph of momentum
glyph of mirror image
glyph of loose mana
Monk
glyph of spirit roll
glyph of water roll
glyph of zen flight
Paladin
glyph of the mounted king
glyph of righteous retreat
glyph of the fallen avenger
Rogue
glyph of safe fall
glyph of tricks of the trade
glyph of poisons
glyph of pick pocket
glyph of pick lock
glyph of killing spree
glyph of distract
glyph of decoy
glyph of blurred speed
Shaman
glyph of thunderstorm (psychic scream is a major glyph?)
glyph of the lakestrider
glyph of farsight
glyph of astral recall
Warlock
glyph of unending breath
glyph of nightmares
glyph of health funnel
glyph of fallen meteor
glyph of eye of kilrogg
glyph enslave demon (scourge imprisonment is a major glyph?)
glyph of carrion swarm
Warrior:
glyph of intimidating shout (psychic scream is a major glyph?)
glyph of bloody healing
...and last but not least (?) Priests!
...oh wait... We don't have any... Not even 1.
END OF LIST
Glyphs I think should be minor:
glyph of holy nova
glyph of levitate
glyh of leap of faith
glyph of psychic scream
glyph of scourge imprisonment (seriously why is this situational spell in a major glyph spot?)