I have very limited space so I'm mostly interested in dwarf (under 12") and semi-dwarf (under 20") flowers.
Specific flowers:
Pansy, Pastel Butterflies
Silene pendula (especially Peach Blossom)
Nemophila Snowstorm
Nolana paradoxa, Bluebird or any blue
Wahlenbergia
Anchusa capensis
Viola odorata
Marigold, Durango Bolero
Begonia, Pin-up Rose
Campanula (any dwarf pink one)
Petunia, Sparklers
Sweet Pea, Turquoise Lagoon
Phlox drummondii, Starry Eyes