Anything orange would work. Some people can't handle orange though.
Here's some Crocosmia in front of Rosa glauca and a couple of seed grown Japanese Maples.
Mike
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Gold tones are the standard accompaniment if you are going for foliage contrast - yellow leafed barberries, Gold Mop threadleaf cypress Sun King aralia, etc.

Another great contrast is the slivery blue of plants like Blue Star juniper, dwarf blue spruce, blue oat grass or fescue, nepeta (cat mint), etc.

Thanks Mike and Gardengal!

I suppose I'm not "standard" then because my thinking is a harmonious color scheme (ie colours next to each other on the colour wheel) of burgandy-red (the shrubs), pinks(mostly bright), purples(bright if possible), medium blues and, grey/blue . For me the bright pinks/bright purples seem to be the most lacking in numbers.

Mike - I do love what you have and red- orange is another harmonious color scheme - but unfortunately orange isn't my color. I do like the Rosa Glauca against the red foliage though. You guys are making me appreciate the silvery and blue leaves that I took for granted! Oh, and I do envy your zone for those lovely japanese maples!

Gardengal - I could add more silvery blue. I do have some grey/blues in that garden already, a "bigears" wooly lambs ears, nepeta, a creeping juniper with a blue cast and they are all good. I hadn't thought too much about them they were just there.

Just to share a few things I think work for a pink/purple approach with burgandy leaved shrubs. I happen to have a hot pink perennial sweet pea growing by accident through the purple leaf sandcherry and it's quite nice. Another thing I have in that garden - is a hybiscus syriacus similiar to blue bird (lavender blue with a deep burgandy marking in the middle of each flower) I also have "Arnie's Choice" daylily and some creeping phlox.

Like most gardeners I'm a bit greedy and always searching for more. I'd welcome more suggestions, especially vivid pinks and purples, perhaps earlier (or later) blooming than the coneflower and liatris if anyone has more ideas.

Spirea 'Ogon' looks gorgeous in front of purple leafed Physocarpus in my gardens. On the ground in front of the 'Ogon' is lambs ears. Stunning combo.

I put these together to see how they would look.
Mike

Apparently the Cotinus has quite a bit of blue in it because it relates more to the all blue hydrangea flower head.