I'd recommend Rh. Lavendula, Fasia are two excellent lepidotes that fit the bill of being a bit more blue.

.

There are far fewer azaleas. Here are some azaleas:Name
Bloom Time
Height in 10 yrs
Hardiness
(ft)
(°F)
Corsage
Mid
5
-15
Elsie Lee
Late-Mid
3
-15
Madame Butterfly
Mid
3
-15
Mildred Mae
Early-Mid
3
-5
yedoense var poukhanense
Early-Mid
4
-15

Sorry for the lack of formatting. I hope this is better:

There are far fewer azaleas. Here are some azaleas:

Name, Bloom Time, Height in 10 yrs (ft), Hardiness (°F)

Corsage, Mid, 5, -15 °F
Elsie Lee, Late-Mid, 3', -15 °F
Madame Butterfly, Mid, 3', -15 °F
Mildred Mae, Early-Mid, 3', -5 °F
yedoense var poukhanense, Early-Mid, 4', -15 °F

Good Luck!

Purple Splendor is a nice azalea that I grow

http://i75.photobucket.com/albums/i283/Botann/041.jpg

Illam Violet is a rhododendron that might meet your needs.

http://i75.photobucket.com/albums/i283/Botann/IMG_3727.jpg

Mike

Rhodyman. Augustinii is an excellent choice and I was going to recommend same, but as is the case sometimes, I grasp for that 'name' which I know, only to be thwarted. I picked up a beautiful specimen from Hank Schannen (R.I.P) which was called 'Berg's Hardy Form'. I have pics of it, and they look more purple than blue. Then again, the eye, which is more accurate, does say it's a decided blue when one views it in actual bloom. Here's a pic of Berg's Hardy Form

Even Rare Finds pic doesn't do the plant justice....http://www.rarefindnursery.com/index.php/rhododendrons/rhododendron-lepidote-small-leaved/rhododendron-augustinii-berg-s-hardy-form.html