I am looking for a childrens book about "Do not worry!"?

I am going to lead a junior church session next sunday about matthew 6,24-34 (Look at the birds of the air; they do not sow or reap or store away in barns, and yet your heavenly Father feeds them. Are you not much more valuable than they? Who of you by worrying can add a single hour to his life?

And why do you worry about clothes?...)and I would like to read a story to the children linked to that theme, but because I am not a native speaker I do not know english books for children - do you have any suggestions? A book with pictures would be perfect. And the story shouldn't be too long.