Definitely a nautical theme for these cards designed for the men in your life.

Shades of the sea for the sailing ship,

http://www.jtcards.co.uk/product/sailing-ship-mens-birthday-card/

Anchors Aweigh! has an anchor embellishment on a background of my own design paper featuring lighthouses

http://www.jtcards.co.uk/product/anchors-aweigh-mens-birthday-card/

and, finally, the same anchor design in silver is a classy and elegant card on black and white circles.

http://www.jtcards.co.uk/product/silver-anchor-mens-birthday-card/