I'm not sure if you are doing something to raise money per se, but what about having an Organ Drive, where you get people to sign up to be organ donors?
Talk to the DMV and see what you have to do to get it done. I believe that most states have Organ donation cards that can be filled out and then sent to the DMV, or have organ donor registries.
For everyone who signs up, give them something car-related, like air fresheners, bumper stickers, etc. You can create a cute logo with a heart or kidney driving a car.
If each house wants get involved, they can sponsor activities that involved "driving" - rent a driving video game unit, make little cars (like box car derby) and race them, have other sorts of "races".
Or, if a group has a philanthropy (like kidney disease, breast cancer), they can tie in their own philanthropic cause and donors (organs, bone marrow, blood, etc).
Have a Red Cross sponsored blood drive.
Just some thoughts if you wanted something different.
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