I don't understand why you need to use litter clean up as a way to promote open carry. You aren't going to make anti gun people warm and fuzzy by picking up after them.
I think open carry needs to just be done quietly and not made such a big deal of. No need to go to extremes.
When I open carry I plan to just act like it's just part of life now. The more normal you act the more normal people will see you. They can get used to it easier that way. Less in their face.
That was my point...I'm not not anti-open carry but it seems a bit disingenuous for folks who don't normally live or conduct business in my town to cruise on in for a show of force, even if it's disguised as community service.
Just go about your daily business armed and polite if you want to 'show' people that we are a law abiding group.