For my 5th project, I made a board game out of found objects.
My constrains were that the objects had to be easy to find and disposable. Also the game had to use recognizable rules of other games.
In my case I mixed the rules of chess and checkers, limited each player to 3 pieces, and let the players pick which types of pieces they wanted to use.
The game is played with 2, 3, or 4 players. The pieces are bottle caps and the type of piece is decided by what symbols that the players write on them.