One year my parents let their zucchini grow "wild" from last years plantings. They ended up with zucchini that had crossbred with watermelon! It was striped and almost egg shaped-not at all skinny. It tasted just the same though.
I found a site that says this about zucchini: "A popular summer squash shaped like a slightly curved cylinder, a bit smaller at the top than the bottom. A zucchini's skin color can vary from dark to light green, sometimes with yellow markings that give it a mottled or striped look." I don't grow zucchini but I've seen striped zucchini before. Here is the site from which I took the above information: http://www.answers.com/topic/zucchini
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