Lay out rice cakes on a baking sheet (this will keep the mess in one area).
Slice banana and set aside.
Spread peanut butter over each rice cake and then place 2 slices of banana towards the upper part of each of the rice cakes. This will serve as your owl's eyes. Dab a small amount of peanut butter on the center of the owls eyes and add a blueberry for the pupil of the eye.
Slice apple in half and then slice the halves into very thin wedges (1/8 inch thick). Place 2 onto each rice cake, (peel side outward) to serve as the owl's wings.
Peel carrot and slice thinly. Using 4 slices, cut into triangles for the nose.
Finally, add some cheerios for feathers between the wings.