Anyway! I like the creative restrictions inherent in using these tubes. It's the difference between staring at a blank piece of paper, and staring at a piece of paper that already has a few lines drawn onto it — it just makes you want to take it further.
Here's how you can make a bunny face like these.
First, flatten a cardboard TP tube slightly and cut it in half — each half can make one rabbit head. Cut the half into sections that are each about 1/3-inch wide. Tip: If you want the rings pretty close to the same width without using a ruler, cut the half-tube in half, and then cut those resulting halves in half.