I love a good X block because Xs mean kisses. Here's a great one-block pattern that I designed to go with the When Sparks Fly collection. It's fat-quarter friendly and works with the Sparks FQ bundle. Alternatively, the pattern includes a handy coloring worksheet so that you can customize it however you'd like.
Finished size for the quilt is 42"x42" or 68"x68" (with a border).