Sculptures can be straightforward representations of a person, animal, building or object. They can also be pieces of abstract art. Sometimes concrete abstract statues are meant to symbolize certain things, but there is a subset that developed in 1930s Europe that has different goals. This "concrete art" avoided the concept of symbolism and instead presented solid representations of shapes, simple lines and primary colors.
You can make any concrete statue any color you want by applying stains before applying a concrete sealant, which is meant to protect the sculpture from stains. Some artists prefer to use concrete in its natural color. One reason given is that people can associate inexpensive concrete with less-than-quality pieces, and the artists enjoy subverting this notion with a more impressive concrete statue.
Issac Cordal did a series of activist projects with cast concrete sculptures. Cordal fashioned small people and positioned them strategically around Europe to make it look like they were up to their waists in water or starving on the side of the street. Other concrete sculpture art projects can serve to commemorate individuals or a group of people, such as the Pillar of Shame in Hong Kong, created by Jens Galschiot of Denmark. The Pillar was erected in honor of the 50 people who died in 1989 in the government crackdown in Beijing`s Tiananmen Square.
You can create a series of concrete statues to use or sell in gardens as a project. Lawn gnomes are a staple of garden decorations and can be all the more impressive in concrete form.
A project involving concrete sculptures is repairing cracks in the statues with epoxy. Clean the broken area of the sculpture with a soft brush and fill in the epoxy at as many points where the two broken pieces will meet as possible. Hold these pieces firmly together and allow them to dry. You can finish the sculpture with a sealer type outdoor finish to hold off weathering and aging, but this needs to be occasionally reapplied because the sun and rain dulls this effect. Sculptures should be completely finished with several coats of sealer every few years. However, many people think that not repairing statues and allowing them to be naturally weathered gives them a desirable look full of character.