That's a great idea of letting the herbs go to seed- the buzzing things in my yard seem to really like when the thyme, sage, and oregano flowers.
I love the yarrow in my lawn, not sure if bees like it, but where I am it's native and great for any lawn with such lacy leaves. And when I leave a patch of lawn unattended, it shoots up and makes beautiful flowers.
I learned whenever you are doing something that might look messy to neighbors, you put flowers around it that will bloom throughout the year. So adding some showy flowers specifically to the edge may be helpful too from a presentation standpoint.
