So is there a xml file and is it wrapped up inside the QtXml4.dll ?
How can I change it/unwrap it?

Emilio Coppola is trying to realize this theme and could kinda use some information I cannot give him. We have been talking on the Facebook page.

Creating themes for LMMS would be even easier if the xml file was easier to access. Or even better, if we could change the colour of the notes in the pianoRoll, the colour of the automation and the big gray and blue areas (the default colour of background). If you download some themes from the lsp, one can easily see which areas needs to be accessible.