There are two variations of this style:
Main
This is the one I consider the primary version with the effect I intended. It creates art nouveau inspired flourishes, symmetrical compositions, and has a color grading effect.
ColorFX
This one emphasizes the color grading effect and has less of the symmetrical and flourishes effect (although they are still there). It's a different epoch from the same training set as the main model. It wasn't what I intended, but I also like the effect so I decided to share both.
Tips
I noticed the smoothness of the flourishes varies a lot between checkpoints. I didn't like the effect in the base SDXL, but other checkpoints looked less choppy. I particularly like this style when combined with other LORAs.
To change up the look you can try adding words like "gold foil", "art nouveau", or "art deco" to your prompt.