Enchant Effects

Red Glow:

Minor Beastslayer
Lesser Beastslayer
Lesser Elemental Slayer
Greater Potency (almost like lightning)
Greater Savagery
Scourgebane
Berserking
Blade Ward
Blood Draining

Yellow Glow:

Lesser Intellect - Two Handed
Major Intellect - Two Handed
Major Spirit - Two Handed
Mighty Intellect
Mighty Spirit
Major Healing (Light yellow in the style of rejuvenation)
Superior Potency

Blue Glow:

Lesser Impact - Two Handed
Striking
Impact - Two Handed
Greater Impact - Two Handed
Greater Striking
Superior Impact - Two Handed
Superior Striking
Major Intellect
Major Striking
Spellsurge
Mongoose (almost like lightning)
Mighty Spellpower (sparkling)
Accuracy
Greater Spellpower - Staff (very bright, moves and sparkles)
Hurricane
Heartsong (sparkles)

Green Glow:

Agility - Two Handed
Agility
Strength
Greater Agility
Potency
Major Agility
Exceptional Agility
Mending (leafy, Druid like)
Mighty Agility

Purple Glow:

Lifestealing
Spellpower
Spellpower - Staff

White Glow:

Winter's Might (base of large weapons, small weapons glow as others)
Icy Chill
Crusader (faint)
Healing Power
Deathfrost
Major Spellpower
Battlemaster
Executioner
Exceptional Spellpower (very faint)
Exceptional Spirit (foggy/sparkly)
Lifeward (faint)
Avalanche
Windwalk

Black Glow:

Soulfrost (very faint)
Landslide (similar to a dirt effect)

Fire Effect:

Demonslaying
Fiery Weapon
Sunfire
Icebreaker
Giant Slayer
Power Torrent

Skull Effect:

Unholy Weapon
Black Magic

Bleeding Effect:
Savagery
Massacre

Other:

Elemental Slayer (multi coloured, represents different elements, very bright)

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If some of them aren't as described I apologise, I took the information I could get from photographs. The lower skill required enchants are usually more plain, with the higher skilled ones being crazy and sparkly.

To check the enchant for yourself, go to WoWhead and search for the enchant, most of them have at least one screenshot.