I just landed on this great project today, and I have to say that I am quite impressed. We're currently using SundayPlus, which is meh, but it works. I much enjoy Openlp's clean interface and features.
One feature that seems to be missing, perhaps from my ignorance, is an ability to customize a song's background image without having to create a new theme with that background. We try to match background content to song themes, so we use a lot of different images. We literally have thousands of background images we cycle through, which also helps keep things fresh. Creating this many themes to account for all the images is a no-go, and customizing a set of themes each week would be tedious. That's probably the only thing about SundayPlus I like: you can change a song's background with just a couple mouse clicks.
So my question...could it be possible to override a song's theme with a custom background without having to create a new theme?