Yes, there are lots and lots of variations. My family makes kimchi out of either napa cabbage or gherkin cucumbers. First they're soaked in a salt brine solution then rinsed and packed into jars with garlic, shredded daikon radish, and ground red chilis. The jars go in the fridge and the flavor improves over time through mild fermentation. I'd describe the flavor as reminiscent of sauerkraut, but with the crisp, crunchiness of a pickle, and a garlic, hot chili flavor. It goes great with meat and rice, like the short rib recipe I posted before.