Dana from MADE shares a tutorial over at the Spoonflower blog showing how she used custom-printed organic knit fabric to make an adorable little tank for a baby. You can make one out of a fat quarter of 54″ wide fabric. She keeps the shape of the top simple so the print takes center stage. She includes a free pattern in a 6-12 month size. (If you need a different size, you could adjust it up or down.) Get the pattern and tutorial.
[photo from MADE]