How can I make my images into themes for Xfce?

At least six years ago, I was able to create themes for a Sony phone interface using a Windows program, and after searching the internet and the software servers, I've seen nothing of the sort for Xfce Linux (Linux Mint, It's killing me not having a means to make my own themes out of images I've made in GIMP, but people are obviously doing this somehow or another, the question is how. Is there a program for this, or do I need to hand-code the Xfce themes? How and where can I get started?

I'm running Xfce in Linux Mint. Nobody's helping me with this over on the LM site (?????), so if you can help it would be most appreciated.

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