Of course, a garden dressed in jewel tones sparkles like no other. When planting out one of my landscapes I contrast deeply saturated hues with foliage plants. For example, this photo illustrates Impatiens 'Blue Bayou' mixed with the broad, green leaves of hosta and the whitish cast of Japanese Painted Fern. I find that intermixing plants such as this is better suited for a serenity garden than a 'monoculture' planting of impatiens or hosta.
I also love the clear colors of deciduous azaleas, specifically the Northern Lights hybrids. Here is 'Apricot Surprise' - a Northern Lights hybrid. Plants are 4 feet tall with doubled flowers of a distinct apricot-peach tone.