So... at risk of sounding overly on brand... Has anyone considered a Glyph that replaces a druid's bear form with a big turtley thing?
Perhaps something like Ghamoo-ra or Kresh?
(I know druids already have a lot of glyphs..... but druid is my favorite class and I want to be able to turn into everything.

)
Let's see about some other glyph ideas...
Warrior
Red rage: your character glows red when you have a lot of rage? (or.. all the time?) I'm thinking about how shadow priest have a purple glow to them. I bet there must be an effect like that somewhere.
Paladin
Holy light: Your character glows lightly with holy light. Subtly, of course. maybe a glowy mist effect. I feel like I saw something on wailing caverns
hunter
smol pet - He's a good boy, but make them a bit smaller.
Permanent pet - Your pet always looks the same. it doesn't matter if they're a cat, a crocolisk or a hyena, they always look like THIS pet. Shouldn't work in pvp, of course. I have no idea how plausible this is, since it would probably need custom creation for each Glyph, as well as rules about what the pet can look like, etc... but... I always felt sad that I sometimes had to leave my starter pet behind. Now Midnight can come with you, even if Midnight is ACTUALLY an alligator
Rogue
Shadow stealth - the rogue's stealthed appearance is the same as a shadow priest.