Because most consumers are afraid of color, and they are also fickle, afraid that if they invest in anything other than neutral they will tire of it and regret choosing it. Manufacturers produce what sells.

Cambria is quartz. Corian is ”solid surface” and comes in a zillion colors. As do other solid surface brands. https://www.solidsurface.com/

For a blue engineered quartz marketed in the US - Tidewater by Pompeii Quartz

https://www.pompeiiquartz.com/product/tidewater/

Same color and company marketed outside the US is called Azur de Mar by Vicostone

Azur De Mar (vicostone.com)

Recycled glass counters (Icestone, Vetrazzo) come in some nice blues.

But I think Palimpsest nailed it: There are 300 options for white and neutral quartz counters because that is what sells. And one blue option, because blue doesn't.

Vetrazzo

"Cambria is quartz. Corian is ”solid surface” and comes in a zillion colors."

"In 1998, the International Solid Surface Fabricators Association (ISSFA) Specification Committee was formed and charged with the responsibility of creating a standard for solid surface. Its purpose was to clarify and simplify the choice and specification of solid surface materials by providing a common yardstick to measure performance and properties. Since that time, other decorative surfacing products have become increasingly utilized by ISFA member companies and the industry as a whole. The original ISSFA name was modified to keep pace with the needs of our industry and its members and is now the International Surface Fabricators Association (ISFA). In 2011, as part of the ISFA mission to provide knowledge and education concerning all aspects of our industry, ISFA began work on a quartz standard that would be a companion to the original ISSFA 2-01 standard for solid surfacing."

More here.

I went down this lath trying to find a decent solid blue for my master shower. There used to be a couple of decent Corian blues that were available through their "Colors of Corian" program that were manufactured but generally not sold in the US. Unfortunately - over time - even they faded from existence.

Tan, grey or white? yeah- they have you covered.

You can get pattered and specked "colors" but the solids are fairly rare.

You'd think they would be desirable from businesses who tend to use more color in their commercial engagements.

Thank you, everyone, for all the info. I feel educated!

just-janni, Avonite Solid Surface has some nice solid blues: Ice Blue, Antique Blue, and Azul.

c3surfaces.com/avonite-surfaces/index.php?group=acrylic-solid-surface

If you buy 80 sheets or more, DuPont, Corian's manufacturer, will make any color you please.

I'll keep that in mind, Joe, next time I need to remodel 60 kitchens at the same time.

When I was in design school, one of our projects was a store that sold baby and toddler clothing and gifts/toys. Corian at that time still produced pastel shades in pink, peach, green and yellow and I got a pale blue from a different manufacturer I think. They were probably holdovers from the 1990s, but they made for a very pleasant scheme overall and they would work very well in vintage bathrooms if people wanted to retain as much vintage color as possible but needed to update something. I miss nice plain colors of materials that are not trying to look like something else.

Hi and thanks @shugee - I got samples of those - they were just a little off for me - but they were the better of all the suppliers for sure.

just_janni, I found a couple of solid blue solid surface colors from a company called Durasein in Bliss Blue and Sea Blue.

https://durasein.com/us/surfaces/

US distributors:

https://durasein.com/us/where-to-buy/

Thanks -I kinda resolved my shower dilemma - but those are not bad!!!!!

Durasein looks interesting, got a quote locally, northeastern Colo, close to half the price of Caesarstone (march 2023), kinda liking the -Cheerful Yellow-