The colored rock or gravel for landscaping I find is most often called River Rock, and you also want it to be washed for landscaping. The mineral content in different parts of the country will make it more or less colorful. In my limited experience, in the Pacific Northwest river rock from western Montana is much more colorful than other rock, with what’s known as Umatilla River Rock being a close second. Here in Seattle all I can find is local stuff which is mostly gray or bagged rock from a company in Rexburg, Idaho, which is nice, but still awfully gray.

Umatilla River Rock can be purchased by the scoop in the Tri-cites area at a landscape supply house, like Beaver Bark in Richland. I don't know of anyone that sells it by the bag. Montana Rock from the Flathead lake area is excellent for maximum color. Getting has become tricky. There was a company in Polson washing and bagging 3/8" pea gravel and 1" – 2" river rock. I don’t think he’s sill in business, that’s what I was told about two weeks ago. I did find this weekend a few bags of the pea gravel at my local Home Depot.