Okay, I'm going to put my bobbin in my mouth, but, here's my thinking...I know he's a toddler and you are going to do this for his bed, but, it will always remain a keepsake I am sure. So, here's MHO..why not pull some more colors for the solids and make a big star for the 'star'!:))Using each of the sports fabrics and more color from the other fabrics, like the reds, golds (from the bats), etc. I'm sure whatever you decide it will look super for they are all fun fabrics to play on!! Anxious to see your creation! Skeat
If you want to do squares, what about a pattern like this called 'scrap squares' at:
http://quilterscache.com/Products.html
or a star called square and points at:
http://quilterscache.com/S/SquareandPointsBlock.html