Currently I have “You Shall Not Pass” and “Honk if You’re From Gondor” on my van. I’ve found “Mordor or Bust” on the web and “Bush is Sauron - Save the Shire” on this board. I’m trying to think of others - can you wonderful people help an obsessed fangirl out?
“Bombadil on Board”
Gandalf pissing on a big red eye
“In case of Ringwraiths, this car will be unmanned”
“Pervy Hobbit Fancier”
“A star shines on the hour of our meaning”
In Elvish, in the Tengwar script.
One Ring to rule them All
Elves make better lovers
Elves do it for eternity
“This car is mine. My own. My PRECIOUS”
“Sackville-Baggins in Trunk”
“I Brake for Ents”
“If you can read this, it must be a crescent moon at midsummer.” (Hobbit reference, actually.)
“Baruk Khazad! Khazad Ai-Menu!”
Nanny Ogg voice Ooooooooo!
Those are wonderful! Many thanks. Aa’ menealle nauva calen ar’ malta.
“Free Rohan”
“Don’t Blame Me, I Voted For Faramir”
I’m on my way to [logo] The Gap of Rohan [/logo]
Still not King
Close Air Support Provided by Gwahir
My Other Car is a Fell Beast
Orcs need love, too!
Mean Maiar Suck!
Vanquish evil now, ask me how
The Few - The Proud - The Dwarves
I think you perchance meant to type “A star shines on the hour of our meeting”. No?
“Let go and let Eru”
I have “I Brake For Hobbits” on my car. As you can see from this picture, it seems like when my SO gave one to Elijah and Dom last year at Comic-Con, they seemed to like it as well. 
There are some goodies in this thread but I favor the classics: “Frodo Lives” and “Gandalf for President”
Brilliant. Just… brilliant.
I may have to make this one for myself.
If ya do, make one for me too, OK?
Slightly OT (but that’s never stopped me before), but 10-15 years ago, I spotted - just once - a California vanity plate reading “NAZGUL”. Extremely cool. Hope he hung onto it.
“For a Good Time, Call Elbereth”
H few friends an I were carring on a disscussion about who was the bigger Tolkien geek.
The winn pointed out that he drove a white car wiht the vanity plate SHDWFX
Sweetums