White painted stones by Natasha Newton - These would make a nifty place card. Just hand your guests a business card with a matching design on it. Then they get to match the card to the rock at their place. They could then take the rock home as a keepsake.
Do you have some old (fruit or milk) crates? Or you just need a practical (and low budget) storage (organizing) system? Try out this brilliant woodworking idea: the crate bookshelf! You can combine the crates in any shape that fits .