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.
This free-form retaining wall posted by Garden Ideas Picture is so beautiful I can hardly stand it! I love how natural the boulders and pebbles look on the hill. And it’s awesome that plants can be mixed into the retaining wall area!