Juniperus conferta 'Blue Pacific'. If this has dropped out of commerce recently for some reason, maybe another J. conferta selection can be used in its place.

I see that this post was from April and its now October but anyway if you can find some "Blue Pacific Juniper" I have been told it roots easily in the ground from cuttings. Just keep it evenly moist.

I just bought 10 of the Blue Pacific Juniper, and our local garden center owner suggests this instead of the Bearberry cotoneaster that I had chosen. The tag says, "an improved shore juniper, capable of spreading 6-8'. Trailing growth with beautiful blue-green foliage." I wanted something that would spread, require minimal maintenance, and would trail down into our ditch.