2. Toss together cheeses; divide cheese mixture evenly among 4 small bowls.
3. Stir in 2 to 3 drops of the blue gel in 1 bowl, 2 to 3 drops of the green gel in second bowl, 2 to 3 drops of the yellow gel in third bowl, and 2 to 3 drops of the violet gel in fourth bowl. Stir each bowl of cheese and food coloring gel together until well incorporated.
4. Divide colored cheese evenly on 2 of the bread slices, colored mayonnaise side down, making a vertical striped rainbow pattern. Top each with 1 bread slice, colored mayonnaise side up.
5. Heat a griddle to medium (350°F to 400°F). Carefully transfer sandwiches with a spatula to heated griddle. Cook until bread is toasted and cheese has melted, 2 to 3 minutes on each side.
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