Great success with planting a slope has to do with the types of plants you use. Here are some great tips, ideas and photos. For low maintenance, be sure to use drought tolerant plants! (Patio Step To Lawn)
This slope was landscaped with boulders, with shrubs planted randomly amongst them. It is definitely more preferable to a barren hillside, but the addition of shrubbery with more color and texture will help enliven this palette.