This is what your tubing can look like when you use the Tube Cutter to inscribe the metal as opposed to slicing all the way through!  Sort of an engraved effect, this result will be easier to achieve if you leave your tubing long and do all the scribing PRIOR to all the actual cutting.  (Leaving it long allows you more metal to hold on to during the turning and tightening process.  See video demonstration for details.)