wrote:

Currently, sandy soil, full sun, probably four feet by 12 feet. We'd
probably prefer relatively low-growing plants, say under two or three
feet. No big shrubs or anything. Daylilies would be an example of the
type of thing we'd like to go for. I'm not sure how drought-tolerant
they are, but they're certainly easy to grow and put on a nice show.

In Oregon, they use Scotch Broom for this. They have many colors.

Here in Pennsylvania, they use a wild flower mix. Then mow it after the
bloom season. The wild flower seed mixes can be bought for various
climates and various effects.
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