I don't have any seeds to exchange, but as it happens, I was reading gardening catalogs and web sites yesterday, looking for bee friendly herbs to plant next year. I had some large spruce trees cut down last year, and built a new garage this fall, so I have some planting to do next spring.
I like herbs--they're hearty, don't require special fertilizer, and they smell wonderful. I have an herb book that lists bee-friendly herbs, including anise-hyssop, bee balm, borage, catnip, chamomile, foxglove, lavender, lemon balm, mints, sage, and thyme (along with many others).
Last year, I saw the girls working catnip and other mints pretty heavily, in numbers similar to goldenrod. I didn't see them working thyme or lavender, but I have less of that, so they may have exhausted it quickly.