The antonyms for the word "cramped one style" would be diverse, varied, multifaceted, eclectic, and assorted. All of these antonyms connote a sense of freedom, versatility, and openness that is in stark contrast to the restrictive and constrictive implications of the original phrase. When one's style is diverse, for example, it indicates that they are able to tap into different genres and moods, and can experiment with different artistic modes of expression. Similarly, eclectic or multifaceted styles suggest that one is not tied down to one particular way of doing things, but rather has a broad and inclusive vision that incorporates various perspectives and influences.