Spread 1 1/2 tablespoons peanut butter or reduced-fat cream cheese on each tortilla, leaving 1 inch of clean space at the top edge of each tortilla. Layer spinach leaves on top of peanut butter. Place three celery sticks across the middle on top of the spinach; sprinkle with shredded carrot.
Keeping the clean edge at the top, roll tortillas up tightly from the bottom, folding in the sides after the first roll. Wrap each burrito tightly in plastic wrap and refrigerate for at least 30 minutes. Remove plastic wrap. Cut each roll into 1/2-inch slices, inserting a toothpick into the burrito before each cut is made.
Serve with yogurt or ranch dressing.