In commenting on Genesis 3, John Goldingay (Old Testament Theology p.139) notices that "God actively blesses; God does not actively curse, but declares that the snake and ground are cursed." While acknowledging that "at one level the distinction is purely syntactical" he goes on to (fairly, imo) comment that "To describe God as blessing but not directly cursing suggests that blessing is Yhwh's natural activity, while cursing is less so...In Yhwh's nature blessing has priority over cursing, love over anger, mercy over retribution."
An interesting example that seems to confirm Goldingay's observation is found in Exodus 20:5 where the Lord delcares that he will punish the children for the sin of their parents to the fourth generation but will show love to a thousand generations of those who love him. Because his priority is blessing, not cursing.
