In March we start looking for early signs of spring. The first flowers in the garden, green buds on trees, the return of songbirds and, of course, rainy days. Grey, rainy days can still bring the chance for bursts of bright color — seen in children’s raincoats and galoshes, cheerful umbrellas, and if you’re lucky, a rainbow in the sky. This week’s puzzler is filled with images from picture books of rainbows. Can you name each book? Put your guesses in the comments below and I’ll be back at the end of the week with the answers.