1″ – 2″ Landscaping New England River Rock. This river rock has stolen the show with its colorful design of prominent red, grey, and brown. You may even find an occasion pink or black stone in the bunch. Its offers smooth rounded edges and has a far greater aesthetic appeal. It blends in nicely with fieldstone boulders and flagstone steppers along with patios, bringing a welcome dimension to a purposeful transition between outdoor living areas and garden areas.