Only 2 brands (and various generic white label copies) are this colorful. Fruity pebbles and Froot Loops. Neither are fruit flavored, the colors are just color, the taste is somewhere between lemon and citric acid, and sugar of course.

They were originally from the 1960s and 70s and were less colorful before the blue dyes of the 1990s were invented.

Cocoa pebbles are far superior and you get chocolate milk when you’re finished, but we only eat that shit for dessert in my house.