I regifted shamelessly, absolutely shamelessly, this year. I received a lovely box of teas from an in-law on Christmas Eve, re-wrapped it that night and gave it to another extended family member 12 hours later (different sides of my family, they'll never meet).
But the best one was giving the pair of gloves that my mother gave me last year back to her this year! She had my sister buy and ship them to me, but I never got to use them so they were still new in their packaging. At this point she has forgotten about them so she was delighted to get them.
FWIW, nothing that I regifted was bad, it was all nice and new. I just didn't need it and I preferred to have the time and money that it would have taken to find another gift. So I was grateful.