I have a schflerra cutting my neighbor gave me, two bromelaids, my ruellia cutting (potted), and my phlox cutting (potted).
The bromeliads have overwintered outside before (they're up against the house on the back patio near a corner (the kitchen juts out some from the house and is right next to the back patio so it makes a corner). If it freezes, I usually throw a frost blanket on them and they're fine, but given the lows this week, I'm going to put them in the garage and cover them with the frost blanket for extra measure (since the garage isn't insulated or heated).
I also think I'm going to cover my dwarf ruellia out front in my ring garden with a frost blanket (since it is out in the middle of the yard, I think it's more exposed). I'm unsure if that's necessary but it wouldn't hurt either, I don't think. I'm concerned about ice since they're predicting rain Thursday and I remember the owner of a a local plant nursery here saying she had a customer that lost one a few years back during an ice storm we had. Not that I don't have a bunch of seeds to replace it if need be though.
I also want to cover a fern in my shade garden since it seems to take a really long time to make new fronds and it does lose them if it gets too cold. It's my Japanese holly fern. It took all year to look good again after a hard freeze we had back in April this year. I didn't cover it, thinking it's be fine.