so much potential w/this one. You could actually leave that one in place, paint it and get new doors and drawer faces for it. super easy. do a full overlay door though to hide the hinges.

you could do plain shaker doors / drawers like this, and paint everything. get new top. This is Hale Navy.

here's one w/a bold floor, shiplap around the sink, and coordinating black accents.

you do something like this console sink

If you do this I'd absolutely go wild w/the tile on the wall behind it, and pick a nice mirror and sconces.

can you do simple carpentry? you could get a countertop that goes side to side, and do a vanity w/an open shelving type

this is rustic, but you get the idea. cement countertop too. and wall mount faucet

How cool is this one?? this would be easy do. get pieces of marble set it on cleats on the wall, have a front rim, and then do the same for the lower shelf. wall mount faucet. this is really pretty

I did a bathroom for a client and he had already bought this vanity. it was 36 inches and it fit perfectly in this spot. leftover countertop from his kitchen remodel.

the niche was the old medicine chest and we were going to line the inside w/walnut shelving (the sides too) .

A wall mount faucet is neater, easier to clean, and gives more counter space.

another idea, floating vanity. (like the white one, above)

since this is a small powder room, have fun w/it and go bold w/decor options.

so you talked about going smaller. I love how they did the wainscot w/the wallpaper.

If you did a thicker wood wainscot, it would take up almost 2" of space. doing a 30" vanity, would leave you a few inches on either side. Less than this pic.

but again, don't be afraid to pump up the decor on something like this.

If you get a 30" vanity, you could also build little cubbies on the side to eat up the rest of the space.

this is kind of cool. find some remnant stone pieces, like this marble, and run it from wall to wall.

have it come down the front. do a vessel sink w/wall mount faucet.

That was custom built for the space. If you're doing everything yourself, I would just get new doors and paint the vanity. Otherwise, you can hire someone to custom build a vanity with legs that fits into the space. I would not try to buy something ready made which won't solve your issue with the side pipes.