Decorative Concrete includes acrylic overlays, as well as acid staining.
The pictures below are before and after shots of a porch 
that was refinished using the Acrylic Overlay method.

Here are some more examples of Acid Staining on concrete.

Here the concrete patio pavers, the table, and the fountain 
coping have all received the acid staining treatment.

An example of an Acid Stained and scored driveway.

These are concrete stepping stones that received 
a multi-colored Acid Stain.