Zucchini makes a good twirl-able noodle. However, it’s all about the gadget you use, not the process or recipe. I’ve used a vegetable peeler in the past, but the product wasn’t a convincing noodle.
Now I use the above Titan Julienne peeler that I got at BBY the other day. LOVE IT!!! I have owned a mandolin slicer in the past, but it’s much more awkward and dangerous and less effective than this little gadget. I’m not a big go-buy-this-now kind of blogger, but if you can’t have grain and need a marinara sauce vehicle, zucchini noodles will do the job. Just peel down to the seeds and blanch or saute for a minute. GOSH, I’ve been missing spaghetti!