Comment 1 for bug 170424

Even if Inkscape implemented the freedesktop.org icon
specification (which of course it should eventually get around
to doing) you would still see lots of "non-standard" icons
showing through because Inkscape needs icons that do not
have any corresponding stock icons.

The only correct solution to this problem is to implement the
Freedesktop.org Icon specification, so if there is already a
bug or request that covers that I would have to close this as
a duplicate (I'll get back to you if I find anything)