I created a simple blank template in Word, into which I placed black and white summer themed images. Then I printed the sheets on cardstock and let kids color in the images as they liked. (Since my printer automatically does double-sided prints, it was easy to add a fun logo on the back.) Then they just cut along the lines, and voilà, time to play!
Once I had those made, I decided to do something my girls would really love. So I popped in some of our favorite digital family pictures into the squares, printed onto cardstock and laminated the pages before cutting. They loved it! This is a great way to make personalized gift, by the way. You can expand it as much as you like!