Wow, that turned out fantastic! I made this same pattern last year and like you mentioned, it has a lot of blank area in the background. That ended up being what I disliked about it so much. You did a great job filling those blank areas in with amazing motifs. Well done!
(I have to mention the little square with Luckenbach in it had me instantly singing Waylon and Willie. "Baby lets sell your diamond ring, buy some boots and faded jeans.... :D )