I love the idea of changing up your reading routine. Besides books, feel free to read just about anything your child is interested in. Is your preschooler attracted to numbers? Read a train schedule. Look at a seed catalog to admire the varieties of flowers and vegetables that are pictured. Look at some old family photos.
The idea is to make your routines pleasant and something to look forward to. There is no need to limit yourself to books. The sky is the limit!