According to a 2005 paper by Pomona College researchers Stilian Morrison and Gary Smith, the top twelve “positive” initials are:
I think slangy selections like “ICE” and “FLY” will sound dated soon enough. Too bad “SUN” and “SKY” didn’t make the cut.
Did you know that positive initials might lengthen one’s lifespan?
Source: Monogrammic Determinism? (PDF)