Suggestions for side wood panel selection / choice for a custom 2A3 build...

The main chassis will be metal.  Left and right sides will be wood.

Current options for the main chassis are black powder coated steel, anodized / brushed aluminium, or stainless steel.

I'm looking for suggestions on wood (type / color / grain) pairings for each metal chassis type / finish?

Your favorite(s) be they commercial or custom builds? If you have images to share, even better!!!

My preference is for understated, refined, and modern...

At present, I do not need to match with an audio rack or console or other furniture / room color choices.

Thanks!

[Note: this is a 4 chassis build]