This is a cool technique. Here is my attempt using a night-time photo I took of the Galata Tower in Istanbul last October. I used the G'MIC plugin in GIMP to split the wavelets (Details > Split Details [Layers]) with "9" levels (8 details and the residuals). I then loaded these on top of the original image as layers.
I used "Dodge" merge mode to merge the residual colors onto the original image, setting the residual layer's opacity to 35. I thought "Dodge" merge mode worked better than "Color" mode, as it really made the more colorful parts of the image brighter.
I then used the "Grain Merge" mode to merge the two coarsest levels of details onto that. In G'MIC it labels them coasest to finest (1 - n), so that was levels 1 and 2. I left the opacity of level 1 at 100%, but reduced level 2 to 50%.
Here is the original image:
Here's the version after doing this procedure: