Something like this? This is an NKBA photo. I do not know who built the bath, except it was not me. The best way to get ideas is just to search the web finding baths you like and build an idea book. Pinterest.com makes this pretty easy. For the four stages of planning a remodel, see The Remodeling Design and Planning Process, by our chief designer Jon Lo.

Master bathroom, wanting to change mirrors and lights, burn it wanting to spend a ton..: suggestions for biggest impact ? Want glam, modern / traditional

Wanting to change mirrors and lighting, want a big impact at not a huge expense. Wanting glam, modern, traditional. No farmhouse or rustic vibes! Any suggestions ?

Are you asking because you can't spend the money to replace the vanity right now? Or do you want to keep it because of the vintage "charm" of it? I'm assuming if you wanted to change the vanity out, you wouldn't be asking about doing some minor changes to this one. On that assumption, I wouldn't try to fill in the grooves, because you would have to paint the whole vanity to cover the fill in. Being a Formica surface, painting wouldn't be a good choice for it. However, painting the grooves would work. I'd pick the darkest shade of the taupey color in the Formica pattern for the grooves. Also, definitely change out the hardware for something more current. But, it looks like the cabinet hardware has a scroll back plate on it, so that might leave a mark on the cabinet front if you remove it. Maybe take one off and check if this is the case.