Take all of your diced ingredients and add them to a large salad bowl. Throw in the spinach and the feta, mix up, then add in the greek dressing. I say '4 tbsp' above, but add as much or as little as you want. It should look like a salad (mainly because it is!) Warm up your Gyro wraps in the oven for 10 minutes, throw the salad mix on a wrap -- wrap it up, and voila. Makes 4 medium sized (not heavy) wraps.
You can spice things up by adding in your favorite ingredients -- like shredded carrots, zucchini, etc. I've even added some freshly ground parmesan cheese -- very good as well.