Spread the refried beans evenly across the bottom of a shallow serving dish to create the first layer.
Spoon the guacamole over the beans and smooth it into an even layer.
Mix 3/4 cup of the sour cream with the shredded cheddar cheese, then spread this mixture over the guacamole.
Pour the salsa over the cheese layer and spread it gently to cover.
Place the remaining 1/4 cup sour cream into a small zip-top bag, snip off one corner, and pipe concentric circles on top of the salsa.
Use a toothpick to drag lines from the center outward through the circles to form a spiderweb pattern.
Scatter the sliced black olives and green onions over the web as a final topping.
Serve right away with tortilla chips on the side.