If you still like some old tiles that have been used in your home, you can reuse them by taking the right steps to remove them and clean them up. Using old tiles again will save you a lot of money, or at least a little if you still need to buy a few. Removing old tile from a wall or floor takes time and patience, and you will need to be careful and take your time so you don't break them in the process.
Chip and scrape away the grout between the tiles, slowly and gently, with a sharp utility knife and a small chisel and hammer. When all of the grout is gone, stick the end of a putty knife under one of the tiles at the corner of the tiled area and gently pry it upward. Work your way from the corner, prying the tiles up one at a time.
Grip a removed tile in a vice so that it stays secure as you work, with the bottom facing up. Use a cement grinder to carefully grind off the remaining grout and mastic. Work slowly so that you don't accidentally grind down and thin the tile.
Dampen a lint-free cloth with some clean water and wipe away the dust from the grinding on the bottom of the tiles. You can reuse the old tiles after the backs have completely dried.