I really appreciate plants that look good late in the season.
Some things to enjoy now:

Hyacinth bean are huge. Seem to be blooming a little late, but are loaded with flowers now and should be loaded with beans in a couple weeks.
Pineapple sage-Pretty, tasty red tubular flowers.
Mexican bush sage-Mine hasn't bloomed yet, but the flowers are fuzzy, purple and plentiful.
Winter savory is covered in white blossoms now, and the trailing variety will follow soon.
Snaps-Maroon and pink are both nice, along with some odd colored sports.
Along with marigolds, I think snaps, parsley and nasturtiums look better the later they go in the season.

I use Labor Day as the time for last BIG harvests from woody-stemmed herbs like sage, thyme and santolina. This allows them time to develop new foliage before cold weather sets in. I usually include rosemary in the category. Mine is so big, since it survived the winter outdoors that I'll continue to harvest it till we get a freeze.