If you are suffering from donor's remorse, then you might want to read a recent article in FinancialMagazine.com titled "After Budget Deal: Donor’s Remorse."
The article addresses any interest you may have in undoing a large gift. In reality, whether you can will hinge on precisely which strategies you employed and the language used. Be sure to consult with your professional advisors on this.
That noted, however, 2012 was still a good year to give and most likely will do wonders for your overall estate plan. Don't be to hard on yourself. After all, unless you had a working crystal ball, who knew how the fiscal cliff deal would go down? Just think if the transfer tax laws had reverted to their default settings. Your savvy gifting would have been prescient, to say the least.
Whether you currently suffer from donor's remorse or not, there always is a lesson to be learned from every life experience. Such was the runup to the fiscal cliff deal. What, then, are your takeaways going forward?
Reference: FinancialMagazine.com – Private Wealth (January 11, 2013) "After Budget Deal: Donor’s Remorse"