It's possible to view granite slabs in various colors at Stone Network.com, Marble.com and the Oldcastle Surfaces website. These sites provide information on granite samples' possible uses and country of origin.
Stone Network.com displays an extensive number of colors in Chinese, Indian and Italian granite slabs. Click on the home page link for one of these granite types, then chose from several alphabetical links on the page that follows to see a range of colors.
At Marble.com, colors are listed alphabetically. Click on a photo, then review the additional provided information, such as country of origin and practical application. On the Oldcastle Surfaces website, it's possible to explore granite shades in color groupings such as beige, black and blue and also to see photos of the granite in actual use.