If your guy has hobbies, you have a head start.
Fashion jewelry is associated with women, but don't rule it out of your search. Braided bracelets, anklets and necklaces are happily worn by men too. Look for ones associated with his hobby - a fish hook bracelet, a carabiner bracelet, a gear bracelet. A silver fox necklace is the current favorite. Consider using the colors of his favorite team. I've kept the guys in mind when designing my jewelry.
Even some household things may be the ticket. How about a cigar ashtray or coasters for his desk? Come browse my shop for more ideas. Happy shopping!