A fun, easy thing you can make out of cardboard and paint. Nowadays, a reception without a photo booth is like a picture of the groomsmen where they're not all jumping in unison. It just doesn't happen.
Many couples like to decorate the reception with pictures of themselves, and a fun picture frame is like a work of art all in itself. If money's an issue, you can get a wide variety of frames at a thrift store.
It's not a DIY wedding without some mason jars! Buy some waterproof chalkboard labels at any craft store and stick them on the jars. Now your guests have a drink glass that they can label. Plus at the end of the night, they can take it home with them. Everyone loves a party favor!
Some shoes are painful to dance in. Offering your guests flip flops gives them one less reason to avoid the dance floor. You can personalize them by adding easy-to-read shoe sizes in your wedding colors, using stationary paper.
Think of this as the first aid kit for you big day. Bobby pins, safety pins, chapstick, a thread and sewing needle...basically anything you might need to make your wedding day a little easier, make sure you have it. Preferably in a mason jar, because after all, you love Pinterest.