While in Austin this weekend we dined on creole food and it was delish! The restaurant had the cutest table decorated in a mosaic pattern with bottle caps. It was very cute and I thought it'd be great on a patio. So, save those bottle caps and get crafting!
How I would tacke the project is start by covering a wooden table with some grout (you pick the color) and then continue with your pattern by pushing down the bottle cap so as to get it to "stick". Once your pattern is done, fill in the gaps with more grout. Grout is really easy to use and it's water soluable so it's easy to wipe up when it's damp.