No pictures.................: ( of any of the spaces - let alone what is near or opposite the dining room?

I had a color in my last home that was very similar to Collingwood. I had it with blues and greens that were close to BM Wyeth Blue and Beach Glass or SW Comfort Gray.

A qucik internet search yielded these complimentary colors.

• Classic Gray OC-23: A lighter, warmer shade of gray with a violet undertone
• Chantilly Lace or White Dove: A neutral white that lets Collingwood's undertones shine
• Edgecomb Gray: A gray with slightly green undertones that brings out Collingwood's violet undertones
• Soft chamois

@Norwood Architects - I think you missed that they are looking for a blue.

Suggest a different approach vs basing decision on Collingwood (which is neutral and will work with almost anything). The more important factor is complementing the dining room’s art, rug, fabrics, being north facing and deciding if you want moody or light. If you want a connection to Collingwood, include color in the some accessories, ie: a rug.

Start narrowing/test a few, comparing at different times of the day and your decision will be much easier; be sure you like how it feels with the White Dove.