Remember what was said, 2 colors does not have to mean only 2 fabrics. Using lots of prints in the same colorway adds so much interest and pizazz to the quilt. So go ahead and do it in navy and yellow.. or whatever you choose. But here is a great way to save some money by buying remnants and using your scraps to add some sparkle to your quilt. Or do an ISO (in search of) here on the board and ask for scraps in navy blue or red or your color of choice.
Many of our quilters don't use their scraps and are happy to sell them for a low cost or pay them forward for the price of postage. This looks like a really fun project!
Hugssssss and smilessss