
Certified GKH Gardening Expert
You can soften the edges by planting perennials close to the edges. Or border the walkway with variegated liriope or other small ornamental grass or sedge.
If the paving stones have space between them you could add groundcovers such as Elfin thyme or Dichondra.
https://www.gardeningknowhow.com/ornamental/groundcover/gcgen/planting-between-pavers.htm
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-8/zone-8-perennial-plants.htm