Speed painting, at least in the communities I was introduced to it, is an interesting way to rapidly produce interesting looking and quite impressionistic painting. I've seen Speed Painting also applied to those artists who show their work greatly speeded up - certainly these are still painted extremely quickly (and far better than I could do) but for me a speed paint needs to take less than an hour to complete - usually much less.
Anyway, here's my latest couple. I usually post work in my blog, but I guess I need to post here more before I can link you to it If you like these I'll post some more, but I haven't time now - that works as a compromise.
I really need to make a note to post on here more often anyway; until now I've only used the user gallery.