Personal opinion.
Key word is UNDERSTATEMENT.
I do not like earrings, yellow gold, chains or large chunky jewllery on men (Sorry Mr. T! I think that pretty much covers you!!) If it counts as "bling-bling" it's probably "bleh-bleh" to me.
Men usually accessorize with a nice, classic watch appropriate to their personality. Also, usually a simple, dark-toned, perhaps leather, briefcase or similar type bag. In the winter, well-chosen hats, scarves, and gloves enhance any look.
Also possible: Simple bracelets, necklaces or rings (not all at once) in silver-toned, plain metal (or even better, not in metal but in something else - leather, wood, etc). No diamonds in any rings (keep rings to a minimum!), and if must wear a diamond (not necessary,) maybe have it in the watch face. Please god no pinky rings.
I like punky/gothy accessories on males (done understated, with class). I also kind of dig the laid-back surfer/hippie jewlerry. I really don't care if it's in fashion or not. It's hot and youthful and that's what it comes down to for me.
EDIT: on second thought, I was thinking only about caucasian skin tones but gold-toned jewlerry probably looks good on guys with darker skin tones. But I feel it looks gaudy on guys w/ lighter skin (white/asian)