I went out to a local horse racing track this past weekend and took some shots during one of the races. These are a couple of my favorites. I don't know how well the borders will show up here because of the dark backgrond of the board.
Defiance - thanks for the feedback. To be honest, the border was something that I thought I'd try just to make the pics stand out a bit. Almost every image that I see that has been digitally matted in <insert name of photo editing software here> has straight, clean borders. I was going for something unique. Also, straight edges seem to work best with a drop shadow. Can't do that with a black background. I can try it with a straight border and see how it comes out. I'll lower the opacity on the black background until it's something like a medium gray, drop a shadow, straighten the edges and see what happens.
Gambit - as for catching the horses at the same place in their stride, I'd like to say that it was something that I meticulously planned. The honest answer is that it was pure dumb luck. I only shot this one particular race. I knew where I wanted to start shooting (as the horses were coming around the bend) so at the right moment I just started holding down the shutter button and caught them going by as I was zooming out at the same time. I think I took something like 30 shots in 10-15 seconds time. As I processed the photos at home I picked out the few that I liked most and framed them as seen in this thread.
Right now, it seems like a lot of my best work is happening by accident. Hopefully I'll get to the point where my best stuff happens on purpose.