Cable really is the easiest "next step" Somersaults . I taught Hairypotter over coffee at the Glasgow Blanketeers meet-up. It's so easy, yet looks so impressive.
You just need to get a cable needle (a wee short, double pointed needle).
Here are some simple instructions: Start with a purl row. On Row 2, purl a few stitches, then, to twist one way, (say, a twist 6 stitches wide), you slip three stitches on to the cable needle (pretend you are going to purl them with the cable needle and then just transfer them on to it) and leave it at the front (for a twist to the left - this is called C6F) or the back (for a twist to the right - this is called C6B). Knit three stitches and then knit the three stitches on the cable needle, purl the next few stitches (depending on your pattern) Purl the whole next row. Next row, purl when you purled in the cable row and then knit when you knitted (ie the cable row). Repeat these last two rows (ie simple knitting and purling, no cable) another 5 times. On the 14th row, repeat Row 2 again. Repeat rows 1-12 until required length is achieved.
You need more than 33 stitches in order to achieve the requisite 6" wide, as the cables pull it in. It's also better to put a stabilising column of rib on either side of a cable, if you are doing simple ones.
For this square, the instructions would be (from memory: I adapted it from a cushion pattern I had). I've changed it ever so slightly, as in retrospect, I think the twists would have been better the opposite way round. I've also widened it slightly, as from memory it was a bit narrow. This pattern creates a garter stitch background to the cables which I think is quite attractive.
Cast-on 39 stitches.
Row 1: Purl
Row 2: Purl 3, knit 3, purl 3, knit 6, purl 3, knit 3, purl 3, knit 6, purl 3, knit 3, purl 3.
Row 3: Purl
Row 4: Purl 3, knit 3, purl 3, C6B (slip 3 stitches onto cable needle, leave in front, knit 3 and then knit the 3 stitches on cable needle), purl 3, knit 3, purl 3, C6F (slip 2 stitches on to cable needle and leave behind, knit 3 and then the 3 on the cable needle), purl 3, knit 3, purl 3.
Rows 5 to 12: Repeat rows 1 and 2.
Repeat Rows 1 to 12 until 6" long.
You can finish on any row except a cable row (which would make the cast-off a bit difficult/twisted).
Hope I've written that down OK! :)