Since shuttles from hotels weren't in our budget, we decided to ask the elementary school just down the street from my parent's home if people could park there. Honestly, I wasn't very hopeful. I can't imagine that it's great for liability to have a bunch of people parking on school grounds who will be attending a big party. But my mom asked, and surprisingly they were totally fine with it. They even put it on their office calendar in case any teachers showed up that day and were alarmed by the number of cars in the lot.
(School bus photo via Elizabeth Anne Designs)
When we sent out the invitations they included a quick note about where to park and mentioned that those who couldn't make the short walk were welcome to park in my parent's driveway.
All in all this worked out well, and might be a good option for some of you having an at-home wedding (or really any wedding with no on-site parking and a large parking lot nearby that you know will be empty on weekends).