Those Rothkos are an art fail, seemingly self acknowledged by him
This is the effect he intended these painting to have:
The following June, Rothko and his family again traveled to Europe. While on the SS Independence he disclosed to John Fischer, publisher of Harper's Magazine, that his true intention for the Seagram murals was to paint
"something that will ruin the appetite of every son-of-a-bitch who ever eats in that room...." He hoped, he told Fischer, that his painting would make the restaurant's patrons
"feel that they are trapped in a room where all the doors and windows are bricked up, so that all they can do is butt their heads forever against the wall."
then
Once back in New York, Rothko and wife Mell visited the near-completed Four Seasons restaurant. Upset with the restaurant's dining atmosphere, which he considered pretentious and inappropriate for the display of his works, Rothko refused to continue the project and returned his cash advance to the Seagram and Sons Company. Seagram had intended to honor Rothko's emergence to prominence through his selection, and his breach of contract and public expression of outrage were unexpected.
So he made them to piss off and create a sense of doom amongst the rich diners, then its sounds like once he saw how in situ they were little more than inoffensive corporate art he pulled them and gave the money back (fair dos).
Nice try in pissing these people off, but didnt quite work. I guess its a bit like Warhols Electric Chair screenprints which were a test to see what horrors rich people could be duped into paying for and putting on their walls