I like red, black, blue and white color combinations although not all those colors need to be used. If yellow is used use it sparingly. My favorite images from the ones that I've suggested are the Steele Interactive and Good Games,  Maybe a bowling ball with a left handed hook to the left and the words "Left Handed Bowler" off to the right would work, similar to the Steele Interactive logo. I would like for this to have a white background, not black.  Image dimensions should be 480 width by about 300 px height..

These are all fantastic submissions but I like the icon with the imagery the best so far. The pins in action and the bowling ball with the left hand make it really stand out.

Thanks everyone for all the great submissions and for making my choice so hard, a pleasant problem to have!

Very responsive, very talented. Willing to go that extra mile.