There are several good articles in the May Bee Culture on the general topic of planting for bees that might interest you.
I love those green Sweat bees!
Yes, I read that issue carefully, along with a local wildflowers association that has a great bee list.
I feel the same way about the Sweat bees! The first time I saw them, I had no idea what they were, then they were featured in an insect identification feature in
Horticulture. We also have a second smaller native bee that is white/black striped -- couldn't get a proper pic of it today, but it's very cool, too

.