This can come in handy to load images that are not in an icon theme, but still benefit from symbolic recoloring.
https://bugzilla.gnome.org/show_bug.cgi?id=760536
beec55a Add a way to load recolored icons in CSS
gtk/Makefile.am | 2 +
gtk/gtkcssimage.c | 2 +
gtk/gtkcssimagerecolor.c | 215 +++++++++++++++++++++++++++++++++++++++
gtk/gtkcssimagerecolorprivate.h | 54 ++++++++++
4 files changed, 273 insertions(+)
Upstream: git.gnome.org