See post #1,185 on page 198 :) Our wood chips always slip down. We are considering whether this can be stabilized with ground cover plants. We are also thinking about creating small terraces with stone slabs.
I would create a great rock garden. Cover part of it with the mentioned creeping spindle, which grows like weed here but can also be easily trimmed if desired. It also comes in different colors and is not expensive. And design part of it with stones of various sizes, with many different plants in between. If you like, also include a part with cacti; there are also frost-hardy ones.