A reader (Robert Langton) suggested http://oliversin.eu/. It has a lot of beautiful paintings displayed on it. Many of them are math oriented. The artist’s bio is:
Oliver Šin is a Hungarian artist based in Budapest. His influences come from street art, underground and pop culture mixed with scientific interests. The focus of his artworks are built around some kind of prophets, visions with dates, real places and existing people. With direct brushwork, he mostly uses unmixed colors structurally, like an abstractionist, but in the service of a narrative agenda. Color holds his pictures together, and through it they command a room. Images can read without effort – the words, the colors and the construction -, but cannot be decoded accurately like a prognosis of a fortune-teller.
Check his work out and let me know what you think!