Swatch 13 - Single Cross Cable, on the left.
Swatch 15 - Windblown Cable (knitter's choice), on the right.
Edited April 30, 2007 to add: Evaluators mentioned that the cast on in Swatch 13 may have been a little tight saying "note how the lower edge has rounded corners". And for Swatch 15 that there were "some tension irregularities in the reverse stockinette portion bordering the cable".
The rest of these, and many more attempts that were frogged, are not being handed in. They were just some of the background work that is involved with coming up with a finished swatch. I found Swatch 15 - "Your Choice of Cable" to be particularly labor intense as your choice has to fit within some rather strict guidelines. Finding a cable pattern that had a workable number of stitches, not too many rows, and could somehow be "balanced" on the swatch required a lot of research and experimentation.
At the top of this second picture (unblocked) is a tiny experiment with "Banded Cable" that I decided I didn't like. On the lower left is "Loose Five-Rib Band", which perhaps could have worked but I was having difficulty finding a point where it looked balanced top and bottom. In retrospect, it might have been okay. The swatch on the bottom right is of course, the "Windblown Cable" without the stockinette down the sides. I had it all completely done and blocked when I realized that when the instructions said "Place P2 on either side of the cable" that they might have wanted ONLY two purl stitches on either side, not ALL purl as I had done.