I picked something like this. Haven’t bought it yet and I don’t remember if these pics were from Lowes or Home Depot. They have similar offerings and you might need something more beige.

The vanity was from Home Depot.

Bathroom floor tile is a wood plank look from Home Depot, but Lowes has lots of options for that too.

I prefer to support local/independent tile stores which are usually family owned. A few specialize in high end lines, but the majority carry a wide selection of tiles at all price points.

Even in rural locations, there are choices outside the big boxes if you are willing to travel a bit.

I agree get a different contractor , this is your home . I like 12 x24 porcelain tile for both bathroom floors and shwer walls then a smaller tile same color family for the shower floor . IMO the fewer finishes and grout lines in a bathroom the better and I aslo find you will like it a lot longer . As for where to get the tile there are 100s of tile shops including Lowes if you find what you love there the tile is not inferior . BTW hopefully the contractor has an actul tile setter not himself. First and foremost the shower has to be built and waterproofed properly . Take picures of the waterproofing and postt hose pics here before tiling is started.

I too am skeptical that a real tile setter wouldn't have a relationship with a real tile store where you could choose tile. If you let a rough carpenter lay your tile you are asking for trouble. A bathroom involves many different trades and no one is an expert in all the building trades. You are going get shortchanged somewhere. As other posters have said, the waterproofing is done before the tile and it is crucial. Someone who doesn't do tile all the time may not do this correctly. Then your tile job falls apart in a short period of time.

The other advantage to a real tile store (besides a wide selection) is that they (in my experience) have very educated/experienced salespeople who will help you create a beautiful bathroom. They know their products and know what goes together. They will also be able to help you stay in your budget, whatever that is. Try getting that at Lowes. Lowes is great if you know what you want and they stock it. You're in and out in ten minutes.