Yeah, I pretty much grab a handful of spikes, knives, etc., and set to. Unfortunately, right now, I've only got the one target, and my shop setup is such that I can really only vary my range by about five feet, tops.
Still, it helps to get a general ability to "feel" a knife out and know how it'll rotate. I'm not very good, really, but I can usually feel a blade and get a half rotation, pretty clean. On rare occasions, when the stars all line up for me, I can do this in very impressive situations--once, in a college dorm room, a bunch of us lads were sitting about, bored, and I was throwing my penknife at an airgun target on the closet door (vandalism, I know, but we were bored...and that makes it okay, right?!?
). So anyway, one of my mates tosses me HIS knife, remarking how it was impossible to throw, balance was all wrong, wouldn't fly straight, etc....
I caught it, flicked it open, and without even pausing, just flipped it into the target, sticking it perfectly into the door, just below the target (we always theorised that the target itself represented the head, and thus, the knife would have been dead center in the throat). After a stunned silence, he looked at me and said, "You couldn't possibly do that again!"
I looked back at him, folding my own knife up and putting it away, and simply said, "Do I need to?"
Probably one out of my lifetime quota of what, five, moments of cool? Still, it made my life easier...
So, yeah, it's good to throw various lengths, weights, styles, etc.--don't just learn to throw *A* knife from *A* distance.