I have just extended my pation by two feet and used sand for the base. My problem is now the sand that shows between the bricks is lighter than the mortar that I used on the other part of the patio. Is there a way to dye the sand? I used mortar on the first part of the patio because I just layed the brcik on top on the cement. This last part there was no cement so I just filled the area with sand and then layed the bricks. Any suggestions??