If you are doing water features, you can put a coat of latex paint, several coats and then put a layer or two of fiberglass then more paint of some type. Fiber glass resin can be tinted also. Non water areas done in cement, sand and bonding agent and then painted or stained to taste. Add some moss or other garnish and serve.
Another fabulous post from the U.S.Department of Wild Imaginings, now in spectaclar stereo, sponsored by the Adhesives and Sealants Council, suggesting ways to stick things together since the 1800s. Not fabulous in a gay way. Your results may vary. Illinois residents add 8% sales tax. These posts have been made by professional post makers, do not try this type of posting on your own without extensive training, lovely assistants and a trusty clown horn.