I'm a real fan of daylilies and lavender mixed in with bulbs. I prune my lavender every winter to keep them neat and of a reasonable size, so they're just starting to bush out as the bulbs are dying away, and the dayliles are pretty constrained in early spring as well. A variety of daylilies (especially varieties that re-bloom) will give you color in early summer, and the lavender will be beautiful in late summer.