I've taken the liberty of adding a modified version of the theme that works better in Opus 13. It's included in the first post, while the original is still there as well.
The original theme applied its background image to specific folders and toolbars, which is no longer supported in Opus 13. That never worked well with shared themes, as everyone potentially has different toolbars and folders/paths. The modified version uses the more general settings which affect all folders/toolbars instead, and also changes a few other colors where things didn't look right or readable.
Thanks, Leo, for generalizing what is an attractive theme. Just started using it with Opus 13 (which I am raving about.... what an engaging upgrade... thank you, thank you, thank you!).
One remaining tweak is needed in that the Metadata displays in banded rows. The labels of the rows using the background texture are unreadable due to the lack of contrast between black labels and green background. What say you, Mike the Tall, is this correction not too tall to make?
Of course you would have an option specific to Metadata. Another measure of the maturity and versatility of your product. My apologies for asking before looking. Thanks for taking time to point out the solution.