Here are some recommendations for lawn substitutes:

The well-planned native garden can make a positive by impact by lowering water usage, creating habitat for pollinators, and saving you time and money.
Some herbaceous perennials are: bleeding heart, monkey flower, nemophile, wild ginger, violets, clarkia, Oregon gold, Oregon iris, Oregon spring, spring queens.
Groundcovers: Kinnikinnik (Arctostaphylos uva-ursi), wild strawberry (Fragaria virginiana), woods strawberry (Fragaria vesca)
Herbs and Ferns: Douglas aster (Aster subspicatus), blue-eyed grass (Sisyrinchiumbellum), camas (Camassia sp.), western red columbine (Aquilegia formosa), goldenrod(Solidago sp.), Douglas iris (Iris douglasiana), Oregon iris (Iris tenax), Oregon sunshine(Eriopyllum lanatum), pearly everlasting (Anaphalis margaritacea), Cascade penstemon(Penstemon serrulatus), broadleaf stonecrop (Sedum spathulifolium), sword fern(Polystichum munitum), yarrow (Achillea millefolium)
Annuals: California poppy (Eschscholzia californica), farewell-to-spring (Clarkia amoena), globe gilia (Gilia capitata)
The native Asclepias speciosa, Showy milkweed, is one that will do well and fill in a space quickly. This eye-catching native herbaceous perennial has become a very popular plant recently for its pollinator-attracting abilities. A key component in the diet and habitat of Monarchs, Showy Milkweed is now an essential element to include in your landscape! Growing up to 4 feet tall, this delightful plant bears pink-white flowers from May to September. Showy milkweed is the primary plant on which Monarchs lay their eggs, and when they hatch, showy milkweed is the primary source of food for all five instars of the larval stage of the monarch's life cycle. Asclepias speciosa is a found in roadside ditches, fields, around fence posts, railroad tracks and other abandoned/distressed areas. Showy milkweed prefers full sun and will tolerate drought once the plant is established. It can be found in dry areas as well as mesic (medium moist) and will do fine in poor soils but needs good drainage.
Groundcovers: Kinnikinnik (Arctostaphylos uva-ursi), coastal strawberry (Fragaria
chiloensis), wild strawberry (Fragaria virginiana), woods strawberry (Fragaria vesca)
Herbs and Ferns: Douglas aster (Aster subspicatus), blue-eyed grass (Sisyrinchium
bellum), camas (Camassia sp.), western red columbine (Aquilegia formosa), goldenrod
(Solidago sp.), Douglas iris (Iris douglasiana), Oregon iris (Iris tenax), Oregon sunshine
(Eriopyllum lanatum), pearly everlasting (Anaphalis margaritacea), Cascade penstemon
(Penstemon serrulatus), broadleaf stonecrop (Sedum spathulifolium), sword fern
(Polystichum munitum), yarrow (Achillea millefolium)
Annuals: California poppy (Eschscholzia californica), farewell-to-spring (Clarkia
amoena), globe gilia (Gilia capitata)
Native grasses: Poverty oatgrass (Danthonia spicata): Hailing from natural prairies and grasslands on either side of the Washington Cascades, this shade- and drought-tolerant and somewhat diminutive grass needs space to fully develop. It doesn't tolerate crowding well and prefers light shade.
Roemer’s fescue (Festuca roemeri): This fescue was once the dominant native bunchgrass in upland prairies west of the Cascades. It needs little or no irrigation and has fine texture, bluish-green leaves and upright delicate seed heads. It is a bunchgrass, so it spreads slowly. It is not invasive. Prairie Junegrass (Koeleria macrantha): Another, fine-leaved, native tufted bunchgrass, it is bluish green with silvery flower and seed heads. Also not aggressive but it is drought tolerant once established.