I converted my first bitmap to SVG and I am happy with the result.
(I've chosen an easy one for start ;))
I have used Inkscape's tool vectorize based on potrace.
More to come.
Right now those icons are hard-wired to appear at GTK_ICON_SIZE_MENU
> (which will generally by 16 x 16 pixels). Most of the icons we
show
> are standard ones that could easily be resized if we made that
> sizing into a variable. But some of them are home-made 16 x 16
> pixmaps that would look bad ("pixelated") at any other size.
>
> If somebody with an artistic bent were to take a look at the xpm
> files in the pixmaps directory of the gretl source (the 16 x 16 ones
> in particular) and produce scaleable (SVG) versions, that would be a
> nice service...
>
It'd be nice if you could make available hi-res versions of
pixmaps/gretl.xpm, doc/figures/gretl-logo.png and doc/figures/hansl-png so
maybe someone could turn those into SVG format.