I'd also be interested in how you achieved this look. I have a '90s townhouse that I am renovating and it has hideous skinny honey oak trim around the windows, but the window casing itself is a lovely high quality wood. I'm wondering if I can just remove the trim pieces, leave the casing as is, and achieve a similar look. Thoughts?

you can't just remove the trim as there will be a gap between the window casing the sheetrock.

maybe remove it and caulk to gap somehow?

That's what I wanted to do in my bathroom. My husband said no. I guess it has to be done well to look nice.

I took off a piece of the window trim to test that idea and @ethiopianbuffman was right - there is a gap of up to 1/2 inch and the sheetrock does not have a nice finished edge up to the window. Caulking that much space runs the risk of looking amateur DIYer. I put the trim piece back on and painted out the trim white and left the window casing in the wood. There are photos of that look here on Houzz that gave me the idea. I quite like how it turned out.

I talked to my contractor about doing this. He said its no big deal, mainly depending on the gap that 'jpatell' mentions. I'm thinking we may do it throughout the house to make things a bit more modern.