To make the "flower" tortillas, take the cookie cutter and press firmly down on the tortilla. Bake on a cookie sheet for 10 to 12 minutes. Reserve in an airtight container.
For the guacamole, combine the first 5 ingredients. Cover tightly with saran wrap. The guacamole may be made several hours ahead and refrigerated.
In small bowl, blend together the sour cream and spices.
To serve, place the cut out tortillas on a tray. Put a dollop of guacamole on each tortilla. Place 1 piece of lobster on top of the guacamole. Garnish with the spicy sour cream, using a squeeze bottle to drizzle the mixture over the hors d'ouevres. Serve cold.