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Delosperma sphalmanthoides -- got to be the prettiest delo I've ever seen. Wish it was a BIT hardier.
Ooh, I have this one. Obviously the hardiness issue isn't a problem for me.
Plantago 'Morocco' -- a relative of that weed in your lawn, but with such great foliage.
Aeniopsis cabulica. Oh. My. God. That FOLIAGE! And zone 5 hardy, with good drainage!
Blue! Dracocephalum ruyschianum
Love these teeny tiny armerias. Armeria caespitosa 'Alba'
Oxalis versicolor -- gorgeous, but not hardy.
Oh that seductive shade of blue... Gentiana angustifolia Frei Hybrid
Scutellaria biacalensis. One of the best.