Ice cubes: cut half a cucumber into sticks and the radishes into thin slices with a mandoline. Distribute them with the flowers over a ring mold and an ice cube tray. Fill with cold water and place in the freezer for 12h.
Cut the unpeeled cucumbers and zucchini into pieces. Coarsely chop the onion and remove the thickest stems from the coriander and parsley. Blend everything with the rice vinegar, pressed garlic cloves, pepper, and salt in the blender or mixer until you have a homogeneous gazpacho.
Pour the gazpacho through a fine sieve and press well to extract as much liquid as possible. Let it rest in the refrigerator for 2h.
Hold the ring mold under warm water, unmold the ice crown, and place it in a shallow, wide, and large bowl. Pour in the gazpacho and drizzle with a few drops of olive oil. Serve in large glasses or bowls and add the ice cubes.
Tips
For an extra fresh touch: mix a handful of fresh mint leaves in the blender. Fancy a Bloody Mary with surprising ice cubes? Just pour a left gazpacho into an ice cube shape.