I have those as vanities in my hall and master bath. Not a fan.
TBH, I just sort of ignored them and decorated around them. I have a sort of babyshit brown in the hall currently- it's been sky blue and mauve in the past. My master bath is currently SW Drizzle, it had been wallpapered with scay tulips on a mayonaise colored background.
Since you have to contend with the countertop, maybe go complementary and do a silvery sage green? Another option is to find a fabric curtain/roman shade in a print for the window and pull a color from that.