I've re-gifted things to people I don't really know, coworkers I'm expected to give gifts to, or something like that. If I'm given something I don't like, and I think someone I know pretty well could get some use out of it (or might actually like it) I just ask them if they're interested in taking it off my hands. I don't exclude the details of how it came into my possession in the first place, I don't pretend like I've picked it as a gift for them. I think I pick out relatively thoughtful gifts for people I know and care about, and I don't want to soil that with some random shit I didn't pick out for them.