rend3r

@Efreak not only tablet. Yep, slider or any other ui element to control size is highly appreciate.

@RaiKoHoff >Using Vector Graphics has been the suggestion of another guy too You can use svg as source for generating raster images in different resolutions. One source - many bitmaps...

You can try to find suitable images https://www.gnome-look.org/browse/cat/132/order/latest/ here. I think, most of iconsets are under clean license.