In a large serving bowl, use all of your hummus to create your first layer on the bottom. Spread evenly with a spatula.
Create your second layer by sprinkling all of your cheese on top of the hummus evenly.
Create your third layer by spreading your pico de gallo evenly and gently on top of your cheese.
Finish your dip layers by spreading your guacamole on top of the pico evenly and gently.
Take 1/4 cup of sour cream and place it into a piping bag. (create your own piping bag by putting your sour cream into a sandwich bag and cutting the tip off of one corner).
Start the web by creating a bullseye design. Pipe a dot of sour cream into the center, then pipe a ring around it, about a 1/2 inch away from the dot. Create another ring about a 1/2 inch away from the first ring, and continue in this pattern until you've created your bullseye design.
Take a toothpick (or grab 3-4 together for a thicker line) and use just the tip(s) to draw lines outward from the center to the end of your bullseye design to create a webbed pattern.
To create your spiders, take a large black olive and cut it in half length-wise (hot dog style). Then cut the other half into legs. (you'll need 8 legs per spider!)
Assemble your spiders wherever you'd like and enjoy!
Keep covered and refrigerated until ready to serve.