Firstly, read about design theory. Designers would love to convince you that what they do is magic, but if you read or even browse through books like "The Art

Firstly, read about design theory. Designers would love to convince you that what they do is magic, but if you read or even browse through books like "The Art of Color" by Johannes Itten or "The Elements of Typographic Style" you'll have a better understanding for the mechanics of establishing a visual style/rhythm, and to me that's the majority of design...establishing a balanced, consistent rhythm.