If you don't like your paws to get cold in the snow (now I'm wishing I'd asked for those booties after all) walk really gingerly like you don't want to put your feet down. It's almost a like a limp, but not quite--you don't want to end up having them take you to the vet. Combine this with really wide-eyed, mournful looks in your human's direction.
Before long, your Mom or Dad will start to feel bad (that they didn't get you the booties after all) and will pick you up and carry you over the snow. I promise (of course, my promise only applies to dogs small enough to be carried, you big guys are on your own) it works like a charm!