Alas, I'm not much of a foliage gardener. What kind of flower does it have is usually the first thing I want to know about a plant. But here are a few things I have going on right now in the way of foliage.
Not an agave, but in the agave family, this is Beschorneria. There are a dozen species in the genus, all native to Mexico. This is B. rigida, possibly B. rigida x yuccoides. I bought it for the flower (somewhat like an agave's, but more pendulous and different in other ways too); I have no idea when it will appear.
Cordyline was a gift. I would not buy something like this for myself, but I enjoy having it very much. I like how the bladed leaves intergrade with Dierama on the left, and harmonize with the bronzy heucheras on the right.
Centradenia grandiflora; I bought it for the flowers. Putting it near the artichoke was a foliage strategy.
'Louis Edmunds' manzanita will flower soon. The way the flat gray-green leaves baffle sunlight is visually interesting all year long.
Succulents are primarily grown for the foliage, which often resemble flowers.
I don't want to overdo it on my first post for Foliage Follow-Up. This is a small garden; I have to ration it out. You can find more foliage follow-ups here.