I ride englissh, But maybe if you have some poles, you can set up a random course like trotting through some poles, then turning into and backing out of a set of two paralell poles along one long side. I could give you some more ideas if you were an english rider, since I am but it's just a suggestion! :)
What about trying games on horseback? There's a book out there that I believe is called "Games on horseback"? Or try "101 riding excercises". It is geared toward the English rider as well as the Western Rider. I don't have either book, but it's out there. If this is not what you meant, then I am sorry in advance I don't know what else to suggest.
My first suggestion would be to take it out of the ring. Go for a nice long trail ride and discover some new ground. Test your horse's willingness and your own by going through challenging/spooky areas. But then again, this is coming from a lowly cowgirl that seldom does any ring work. LOL.
Thanx for the suggestions everyone. Smrobs...i do go out on trails but not alone and my fiance's aunt (the only person I ride with) goes with me but lately she has been busy working on her grants for the theraputic riding program and has been kinda sick so that's why I havnt taken her out of the ring, even though I really want to. She is a little spooky too, but i'm desensitizing her and she's doing really good, she doesnt hardly move like she used to. :)
Boy, now that i'm getting all these great ideas i'm not going to know what to do first. By the way...how to I get her to slide stop? I mean, I kinda know the basics and what not, and when I say whoa, even at the canter, she stops on the dime with very slight sliding action. What can I do to get her to slide real nice?? Thank you guys!!!