Use insets to add different materials to chiseled blocks; each block has 12 different mineral variants. (16 if you count aged copper...)
Blocks inset with glowstone dust make for TASTEFUL decor.
Blocks inset with redstone dust react to redstone components.
Various rarer chiseling patterns.
Blocks inset with amethyst glow in the dark. (Requires Optifine and Mindthemood's Misselaneous pack, which also adds StayTrue compatibility to all chiseled blocks.)
Various basic chiseling patterns.
The legend chiseling pattern, along with some insets. If you've got good taste, some of these should look a bit familiar...
Blocks with a copper inset age slowly over time, and can be waxed/axed like regular copper.