Great idea. You might wanna check into some cheap insurance in case that filthy green watermelon happens to be offended and whips out his handy spray can and defaces such a wonderful billboard.
I'll be contributing to this effort. My guess is that once people start driving by this Billboard, your contributions will multiply.
Good idea and effort.
BUMP the Greenies right out of Oregon!!!
EBUCK
Only if there is a URL to a website or an 800 number on the billboard telling people where to send it.
(Hate to break it to you this way EBUCK... I would feel bad about it except that I am often guilty of such errors myself!)