Well, Mr. Goyal has spoken, and I agree with what he says.
If anybody wanted to go to the trouble, it appears that the button images are stored in the C:\Program Files\Calibre2\resources\images as *.svg files. Such files can be edited using a program called Inkscape, but this is not an easy process. These are not simple bit-map files, they are vector graphic files.
Personally I like the new buttons.
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