Looks lovely and I can really imagine that in full summer looking amazing.
I will watch this thread with interest as I never seem to grow enough of anything to be able to cut them for the house (I like them out there in the garden!) apart from peony heads (why does it always rains when they are in flower so they flop?) and a few dahlias.
What kind of herbs do you want to plant - just culinary or all sorts, medicinal etc? There's a huge range of plants to choose from - which aren't in my head but in various books I have.
One of my must haves is golden oregano/marjoram because it just looks so bright and fresh and amazing in the spring although can suffer from sun scorch in full sun in summer. And this is just in my experience but where regular marjoram spreads it doesn't always retain a nice circular shape like the golden variety does.
Oh dear I keep coming back and editing this.
If you want height then a Perovskia (also known as Russian Sage) in the middle of each bed would look lovely, not culinary but a real bee and butterfly attraction and it looks good all through the winter too with its whitish spires.