My first instinct, take 1 week off from training. Assuming you've been training steadily and consistently for the past few months (with no major rest), a full 7 days of not lifting will: A - Not be the end of the world, and B - Will help to recharge your batteries, so to speak.
Other than that, I don't see any major problems with using the bands. Are you talking about loading a bar with bands only (no plates), or using just the bands by themselves? Either way, I can't see why you wouldn't be able to do either. I'm sure there's a useful article at elitefts.com about band training, I just can't seem to find it now.