Try eBay. There's a lot of salvage materials posted there. Or try emailing photos to an architectural salvage company if you are near a major city. There are also a number of vintage decor forums online that you could try posting those items on. The shower pan/tubs(?) look like the more interesting items just because they're unusual. Try selling as sets and see if you get better response.

don't forget craigs everyone is going there nowadays.

Try wallapop also. I can totally understand that you are not a fan of colors. Also, I would not go crazy trying to sell them, it is time consuming, so if no takers, then try to give them away.

HI -- There are many MCM web sites where people are looking for and selling building materials from that time . Takes some searching . Do you have Kijiji .com in your area ? It is a very popular selling site.

Turns out this is not MCM, rather 1940s era design. And called a Princess Bath Tub. Check out this link

http://retrorenovation.com/2011/05/25/where-to-find-a-cinderella-bath-tub-from-100-to-3900/

maybe they salvaged from another house? Top picture looks like they took an existing bedroom and converted with bathroom. We have the tub that Rusty references above. But it's in a green shade that is unlike most green shades. removing our pink tiles. Thanks Rusty for the hexagonal tile ideas. Yes that would compliment the bath well. cheers -