Thanks for writing. It's really tough to answer this because I don't know what your personal taste is or where you live.
But in general, I like planting silvery artemisia with plants that have purple foliage (think low shrubs such as dwarf weigela or perennials such as 'Firecracker' lysimachia). Some types of artemsia look great paired with ornamental grasses, as well as bold perennials or shrubs such as rose of Sharon, purple coneflower, or black-eyed Susan.
---Justin, Senior Garden Editor, BHG.com