That's an excellent idea, Bonnie. I always recommend my clients pick at least one worthy cause to help support.
And, Candywrapz, if you find a cause you believe in and want to help, you can probably get good exposure from doing a project or two for them "at cost", or donating a door prize, or something to help support them.
Oh, and for walkathons and marathons, there are always goodie bags for the runners/walkers and they are always looking for donations and coupons for those. For you, you could maybe do some non-melting candy (Lifesavers, perhaps?) with a coupon on the wrapper for a discount on a larger order.