I googled
Frost instead of
Frozen and found more results..
Thanks for your input Sallyanne

it opened new doors:
see the tests I did on the red color down..:
I used the brushes from:
"Obsidian Dawn Frost Brushes" which gave good effects, specially the nrs :
SS Frost025 + SS Frost022 or SS Frost007->009
Other brushes worked also nice like:
texture01
texture hose1
bristles
acrylic04
I found also a tute, it is for photoshop but I think it can be used also in Gimp, didn't manage it though:
can't put the link here but u can google: tutorialwiz frost snow
there is a picture of a bush in there:
To convert it to Gimp:
The channel mixer in Gimp, I found in: color/components/channel mixer
and used "Lighten only"
It works like that I think: everything that is white becomes very white and produce snow effect
If somebody manage it, I would be curious to have some feedback how ;-)
I post some of the results with these Frost brushes: