You don't need a uniform color: We used a mixture of brick red, browns and grays, and then threw in seashells, branches and various types of rock, so our walls ended up looking like cave paintings! ↗
I always work out of uncertainty but when a painting's finished it becomes a fixed idea, apparently a final statement. In time though, uncertainty returns... your thought process goes on. ↗
Up until 35 I had a slightly skewed world view. I honestly believed everybody in the world wanted to make abstract paintings, and people only became lawyers and doctors and brokers and things because they couldn't make abstract paintings. ↗