One done with #gimp the other with #inkscape in trying to have white on white or as close as possible without using an outline filter or a gradient that might not work after being exported into png or jpg
This png image was done in Inkscape I changed the stroke to a light blue and used a gradient fill with multiple stops to suggest the colors of snow and ice over a unicode generated glyph meaning white.
The jpg was created in #gimp. I wanted to have lots of white in and around the letters but not a transparent background that might change to black on some screens so I started with a background texture file / fill then added text and then applied a filter.