The atypical combo of roses works very well as they are taller. You could also use them beneath Clematis to aid in shading the soil for the vines.

white campanula, petunias,purple huechera, a niobe clematis above it is stunning..i do like the dark velvet red with the blue...

Yellows are always good with blue. Check out David's slide show for a really good example of yellow (apricot too) roses and blue geraniums.

That said, my 'Brookside' (another blue geranium) is planted with 'Fairy Snow' platycodon (just about the same as the campanula suggestion), 'Nora Barlow Blue' Aquilegia, and some Stachys macrantha (Betony). When I finishing expanding the bed in a couple of months, I plan on putting in 'Mauritania' malva, Delphinium 'Cliveden Beauty', Polemonium careuleum, Polemonium reptans 'Blue Pearl' and Adenophora bullyeana. Guess I need to spice it up with some yellow too. Thanks for jogging my head.

Good growing with your 'Johnson's Blue'

Here is a link that might be useful: David's Slide Show

I have them in the front of my dahlia bed.
jill

Hi,

I have my Johnson's Blue under a Sandcherry - looks great and also around my Clematis.

CR

The geraniums are also good in front of any of the daylilies.

Susy

Under the mock orange which fronts the sand cherry. Alongside is an orange/yellow coreopsis which I've forgotten the variety. Ran out of plant tags (grin).