Glad to hear you sound excited about the Caponata. 'Tis true that you can never tell what a paint color really looks like until it is actually up on the wall in the room to be painted and interacting with everything in there, including and especially the lighting. I also think painting swatches on a wall, even in the room to be painted, is useless. It's so deceived by the existing wall color surrounding it. I have found that, painting the swatch right up to any trim, coming from behind a fixture, like a sink, etc., really helps to get a good idea as to what the color will look like. Fortunately for you, the light in your powder room doesn't really change throughout the day, since you don't have a window, so you won't get any surprises, like in the morning it's great color, but in the afternoon, it goes blah, or whatever. Let us know what you decide and post pics when and if you're able!

You can also look for a wallpaper that represents one of your interests. We could not have children, but have had a succession of dogs, so this one was our version of whimsy.

Can you post a picture of the space? Lighting in the space will have a big impact as well as color of floor.

I think a wallpaper would be a great option to add personality and tie the floor and vanity together. It's always good too, if you can order a sample just to see how it looks with what's in your room. Some ideas to get you started.. https://www.houzz.com/products/dauphin-mustard-lattice-wallpaper-bolt-prvw-vr~124441450 https://www.houzz.com/products/bestsellers-3-wallpaper-roll-grey-yellow-prvw-vr~157210325 https://www.amazon.ca/NuWallpaper-NU1695-Sausalito-Yellow-Wallpaper/dp/B01JC060M0/ref=asc_df_B01JC060M0/?tag=googleshopc0c-20&linkCode=df0&hvadid=292953353435&hvpos=&hvnetw=g&hvrand=806095498640978420&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9001506&hvtargid=pla-315556018223&psc=1