For those who want blocks that can be left exposed, architectural blocks are the answer. These are essentially the same as conventional concrete blocks, except they resemble polished granite, look like hand-hewn stone or tile, or have other decorative finishes.

One popular variety, "split-face architectural block," has an irregular, coarse texture that provides contrast and shadow lines. It comes in several earth tones; the color is integral to the block's makeup. "Half highs," only half the height of conventional concrete blocks (4 inches, not 8) are popular for visual contrast.

Architectural blocks are ideal for a house with a walk-out basement, where considerable foundation wall can be seen, because they eliminate the need for brick veneer, stucco, or other exterior finishes. Exposed architectural blocks look good as interior walls, too. The Concrete Masonry Association promotes a basement with exposed architectural blocks as "Smart Space" because it can provide finished living space for a relatively small investment.

Prices for architectural block vary by type and region. Most run from 75 cents to $1.25 each.