I would love to make stuff like that too...my problem was (is?) getting the lines to fade into a point. :? Which explains my feature request a few days back.
My sincerest apologies if this has been requested before, but I was wondering if it would be possible to add a different style of line ending...one that tapers to a point. Arrows are nice, but I was wondering if this is possible?
(rough example)
@cjmcguinness: That's awesome man...what I wouldn't give to know your secrets...
@andrew d: resize your pictures man! clickable thumbnails!
@buzzkill: that's a wicked awesome car man. Nicely done