I live in an older house (1925) and I have dark wood trim throughout the house which I love but we recently had replacement windows put in. They are white/plastic? Does anyone have any suggestions as to whether I can paint/stain the white part of the windows to match the trim? Thanks!
Just get some nice curtain...
One thing you might consider is putting a wooden frame over the window frames. You can use a half-inch thick by two-inch wide slat, and use a miter saw to cut 45-degree angles on the ends. You can then tack these onto the wall around the window (there will be some wood framing around the window edge, below the drywall or whatever the wall surface is). You can then paint these whatever color you want, even stain them.
I did this for the exterior of windows that I had replaced. I didn't like the look of just the 2-inch white frame around the windows. So, I made some frames out of 1/2"x3" slats and painted them the same color as the house trim. It came out looking great.