I love that fabric line -- such nice colors.
A couple of ideas. You could go with it as-is and make it as a wallhanging -- just add a sleeve. It's a lovely colorful addition for any nursery. Lots of new moms get a ton of blankets and quilts--more than they can use since they're not really recommended for use in a crib.
If you really want to add a border, can you use the remaining charms? You should have at least 15 more. You could buy a second charm pack, slice them and make a piano key border, which I think would be more pleasing overall than either the pink or white repeated.
RST