I would think that every one has the ability to create. Maybe not the equal of Vasarely, Brahms or Ansel Adams, but a charcoal sketch; a watercolour for their personal enjoyment. Don't we see a child's stick figure painting on every refrigerator? But at some time, you see a great work of art and leave with your artist block installed.
Vasarely: VASA ARNY (1976))
Larry Day introduced me to my first great work of art. The Op art of Victor Vasarely. Mr. Day is the father of the guitarist in one of my early bands. 
During a rehearsal break, he said he had a bass drum cover for the band! My first band had the proper descriptive name of "the unknowns." When we combined with another band, some one, who's identity is lost in time, convinced the group to use the name "World of Us." Larry, in the style of Vasarely, made the Op Art cover, with the band's name in contrasting color squares. He used thin "tissue" paper. The result was a very professional emblem.
He showed me his source book on Vasarely. As I turned the pages, each picture looked similar, but the art was so different from normal art. A little seed had been planted. Art was pretty "normal" until George Braque and Pablo Piccaso displayed their cubistic paintings. With the addition of pieces of paper, printed with designs, (Papier collé), the sophistication of modern art paintings, leaped into the stratosphere of human imagination.
Vasarely show an amazing amount of maturity. If you are painting a still life or landscape, you know what your work should end up looking like. Practice and experience should allow you to find your personal style. But how do you see Girl-Flower before you take the paint from the cupboard.
Coming back to Vasarely after sufficient time for the "World of Us" to find its resting place, a picture like the 1963 "Untitled" is a
discovery of inspiration. Combine Bivala, Girl-Flower, Untitled - Combine parts of them - Combine with the color palette of Monet - combine parts of them with the early cubist monochromatic color scheme... I am sure there is a combination out there that will set off my artist's block.