I just did a big change in the behavior of Inkscape icons. Funny thing is, it's a net reduction in lines of code.
Anyway, now when it goes to build an icon, it first asks GTK+ if there's a stock image of that name. If so, it loads it on up. And it also returns the stock GtkImage instead of a new instance of SPIcon built from an extracted bitmap.
One of the things is that now the stock icons being used will reflect the current theme, when before they'd always be the default GTK+ stock icons regardless of what theme was being used. Also... if the theme is changed will the app is open, they stock icons will now change to stay in step.
Perhaps we should use more stock icons. Perhaps we should get inkscape ones pushed out into standard stock land. Perhaps we should have nice SVG inkscape theme sets to switch when main themes are changed. Perhaps...
Anyway, play around and see what comes up.