Two birds with one stone - This idea is perfect for a couple that has a pond or a rock garden. Get yourself some pretty rocks and have guest sign them. Use the stones as centerpieces and even as table numbers.
What I am doing for Lou's teachers at school...super cute and cheap idea. You can also use hand sanitizer and just decorate the bottle. Or, antibacterial hand soap gets two birds with one stone AND they are on sale at Bath and Body Works right now :)