Clearly a pattern can't be claimed strictly for male or female use and sometimes a reference to the opposite sex can add an element of surprise to a space, but these patterns have a long-standing connection to the masculine, both in fashion and design.
Pin Stripes: A favorite fabric for suits and baseball uniforms, pin stripes represent men at work and at play.
Paisley: At home on business men or cowboys, paisley is a remarkably versatile pattern that manages to be both manly and playful.
Plaid: From rustic to upscale, plaid's straight lines are a masculine classic.
Bold Stripes: A perennial favorite, stripes add a regal touch to any space.
Geometric: Though geometric patterns are equally at home in a feminine room, the bold lines and shapes are strong and architectural.
(Images: 1, house to home; 2, 1st Option; 3, Todd Selby; 4, William Waldron/Elle Décor; 5, Jonathan Adler)