Hi, I have recently established a large garden with some meandering paths through raised beds and 'islands' planted with shrubs and perennials. I typically would use wood chips as the surface for these paths, but my beds are all mulched in chips so I need something to differentiate the pathways. I don't want to use stone or any hardscaping and I won't be putting in formal edging, so I'm looking for ideas for a vegetated ground cover that would be fairly easy and inexpensive to establish. Are there any kinds of grass that might work in this setting? It would have to be something that doesn't readily spread/invade since there is a lot of edge to maintain. Or, if not grass, any other suitable ground covers? These areas get full or partial sun, can receive some water if necessary, and will need to be walkable and tolerate a wheelbarrow from time to time. Am I looking for a unicorn? The soil is clay but has been covered in layers of woodchips for years so it's got some organic material as well. Thank you!