Cant imagine much I could really add to what's been said. The only further distinction--which is built in to my art--is that one of the main tributaries is a CMA, and teaches forms to be practiced in a slow, steady progression. The other tributary is Kempo-based, and follows more the mix-it-up speed of some karateka.
So, yeah, changing speeds, pulling out pieces and adding attacks/resistance from different angles (front, back, side, oblique), doing the piece forward, then backward, then forward again (really makes you think about the principles, and get beyond just the techniques), applying the concept of multiplicity (what if I used this for a grab instead of a strike, a throw after the block or added into the transition/turn, etc.), turning students to face different directions before beginning them all on the same form (and sometimes I'll jump in too, because I still have a lot to learn). I use all of these. Sometimes they help more than other times, and some students take to certain things more than others, but that's what makes the journey interesting to me.
Also, kind of an aside, I do my cane forms with a 36" very light shillelagh, a 36" solid crook'd cane, and my 44" heavy oak shillelagh. Very, very different feels and possibilities open up with each one, which then bolsters my use of the others. And BTW, all can be carried on a plane.
