An easy proposition, that: there is mint, borage, sage, cilantro, six kinds of basil, rosemary, and thyme. MIA: oregano and many other less common herbs, washed out by our record rains (2013's 27.54 inches of rain makes this Chicago's wettest year to date on record--Tom Skilling).
It didn't take much effort to get the permaculture windowbox idea started. We took the gone-to-seed, herb-filled window boxes from last summer, helped them drop their seeds into the box in mid-October, and overwintered them outside. Uncovered for the spring rains, it wasn't long before we saw all kinds of sprouting--from thyme and basil to marigolds (lower pic, at left) started from seed last year.
Below are the self-seeded marigolds--French-Sparky variety from Bountiful Gardens--in mid June, healthy and bushy, along with basil (the self-seeded plus new plants we started this spring) and nasturtium, the latter a gift from a friendly neighbor.
Patience is a virtue in the case of these window boxes: there's no early spring splash. Instead you have a nice slow build to this in late June: