This is a picnic table that i thought of and made all in one day. There are 8 2x4's that make the table top, 8 legs with two support beams going across each set (one is hidden right underneath the table) then there are the angled 2x4s for the bottom of the seating
One side of the table obviously has single seats while the other is a bench. There are two hinges at each seat and 4 in the bench part. I get free scrap wood and if you have the room in your yard you can probably get it too by contacting people who do construction because it costs them money to drop it off at an actual dumpsite.
Have fun making your own and be creative!