Choose a shallow glass or ceramic serving dish large enough for layered dip.
Spoon 2 cups Red Pepper hummus (or your favorite hummus flavor) into the dish and spread into an even layer covering the bottom.
Spoon 1–2 cups Greek yogurt over the hummus and spread into an even layer; start with 1 cup and add up to 2 cups to reach your preferred thickness.
Prepare the tomatoes: if using 1 pint cherry red tomatoes, quarter them; if using diced tomatoes, leave them as diced. Spread the tomatoes in an even layer over the yogurt.
Scatter 1 cup Kalamata (black) olives, pitted and sliced, evenly over the tomato layer.
Sprinkle 1 cup crumbled Feta cheese evenly over the olives.
Evenly distribute 1/2 cup sweet red pepper and/or green pepper, minced, over the feta.
Sprinkle 1/2 cup chopped walnuts over the top layer.
Garnish: squeeze fresh lemon over the dip, sprinkle chopped fresh dill leaves and chopped flat-leaf parsley, and drizzle honey lightly over the top. If using additional garnishes from the list, arrange artichoke hearts, peeled & diced red onion, diced cucumbers, canned garbanzo or white beans (drained), avocadoes or guacamole, or additional hummus flavors on top or around the dip as desired.
Chill briefly if you like, then serve.