I am going through the painstaking process of salvaging brick from our old foundation. I plan to use the bricks as pavers in the future. My question relates to knowing when a brick should be considered beyond saving... how chipped can a brick be to be used as a paver? Can it be missing a corner or two? Basically, how perfectly formed does it need to be to be functionally used as a paver (keeping in mind that I love a "rustic" look)?