2D colormaps for spatrasters

I have a pair of spatraster grids, population and water depth after sea-level rise. I'd like to make a map display by creating a 2D colormap based on these two grids. I know I saw something a year or two ago by someone who did some wonderful stuff with 2D colormaps, but I cannot find it. I'm really just looking for some examples. Yeah, this is a bit vague, but I am at that vague "what do I think might be nice" stage.

Perhaps these links could help:

Best,
Zivan

Perfect! Thank you so much! I think that must be what I remembered seeing.

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