On her blog, Sharon Foley has a post entitled, Grass - the Carpet of Motivation. I loved this post!
Essentially this is a point to point pattern, using the grass as both point and motivation. I've done this for years with Cricket. The game is a wonderful mix of love, language and leadership. It can turn an ordinary undemanding time session into a great leadership lesson. It also helps convince your horse that you can have some kick-butt ideas.
There are no rules and no right way to do it. Sharon uses clicker training, I used my PNH games. I'll probably try this with the clicker to see if we can make better progress with it for under saddle work.
I've built this game into a great stick-to-me, causing Cricket to canter with me to get to the next grazing spot. I've used it to motivate her open area liberty, even to the point of canter circles with change of direction.
It's a perfect rapport builder - love, language and leadership in equal doses.