Solid openings for Blitz Chess
Generally, the standard accepted openings in regular chess are the same that apply to blitz chess.  

Gambit openings are more risky in blitz, as they generally involve long-term gain resulting from short-term disadvantages.  Unless you are very comfortable in a gambit opening that returns significant results fairly early, I would generally avoid them.

Some openings that have fallen into disfavor in standard chess may be more valid in blitz chess, as blitz is far more forgiving of slight flaws in strategy (at least at the casual level).

The most important factor for determining what openings to use in blitz, though, are how familiar you are with the opening.  The more you play the opening, the more familiar you will be with the good responses from your opponent, and the less time you will have to take to think about your response.  The best is if you play non-blitz for a while (quick chess with 10 minute clocks, for example) and really familiarize yourself with the opening lines you are interested in.  This will give you a depth of familiarity that will make your blitz game play a lot more solid, and will also result in you being able to play faster with fewer errors.

Surprise openings suffer from the same problem in blitz chess that they do in other forms of chess: if an opponent is decent enough to not be caught off guard by the opening, they are very likely to punish you by exploiting the weaknesses of the opening (i.e. most "fast mate" openings rely upon premature queen development, and hoping that the opponent doesn't notice the danger; good players will immediately become wary upon early queen development, and respond by putting heavy pressure on your queen, taking the initiative from you).