Property owners often assume that their old, plain-concrete pavements or floors have little aesthetic value. However, various engraving tools and equipment are now available to allow contractors to convert plain-concrete surfaces into interesting decorative finishes that will greatly enhance the beauty of existing hardscapes. Engraving concrete involves the use of diamond cutting tools to produce repetitive patterns or one-of-a-kind graphics. Some decorative-concrete contractors even create freehand images using angle grinders or engraving pens. Introducing color completes the look.