I would like to know, what ring you guys think would best suit The Joker?

Violet.

He'd need a prismatic ring that changes each time he uses it.

Joker? I'd say Fear.

He could damn near be a green lantern. His determination is literally at insane levels, since he's made it his life's work to ABSOLUTELY. NEVER. STOP. Albeit in a different way -- rather than continue to shove forward, he just tries again.

And again.

And again.

And again.

Ad nauseum.

wedding ring :P

Now that I think about it Joygirl is right not only does he have crazy willpower it is also possible that he fears nothing

Oddly enough? Green.  
 
He's not angry, greedy, hopeful, loving, or compassionate, but he's got the willpower of a champion. If not green, then yellow, because he's a pretty scary guy.

Green, absolutely Many fear based villains have tried their powers on him. He does whippets with Scarecrows gas cause its funny to him. He laughed his way through Scarecrows attacks. Raven tried her fear magic on him and he laughed so hard he had tears in his eyes and she was freaked out. In Bird's of Prey a villain with psychic fear powers tried it on him. He loved it.

Add to it his incredible will power, as it has been said. Insane will power.

Plus he is creative and imaginative. Kyle was selected in part because he was an artist. I remember some where that creativity can also be a factor.

Plus, it would match his hair.

I'd love to see that story line.But done seriously. Not goof ball like Emperor Joker and Joker's Last Laugh were done..

Again Green would work best, Hey mabey Joker will be in the new lantern army

wow, my mind just got blown a little. green totally fits

Yellow Lantern by far.The same as Batman.They would the ost powerful at Sinestro Corps.

Joker with a lantern ring!!!!!!!!!!!!!

#$%&*!%$#?<><?#%$^*:**$%&#!$*

I may need new pants.

Black - Joker has been missing and assumed dead for a while and Black Hand has appeared.

i saw this thread and my mind was completly blown at how cool of an idea it would be to see joker join the lanterns. just so awesome to think of him in action

anyway, i drew a quick sketch to see what it would be like to see, since i never saw anyone even try this...check it out!

http://www.comicvine.com/forums/artist-show-off/4/green-lantern-x-joker-joker-lantern/710052/#1

He would have orange,red and yellow I would say.

He'd wear ALL THE RINGS.