Make a Gtk.Switch-widget show an arrow?

[Moritz Renftle <rueckmeldung renftle net>]

Hi there,

i'm developing a software that is able to control the model railroad via
gamepad. i use python with pygobject.
now i need to find a widget that represents the direction of the train.
currently i do this with a Gtk.Button showing a Gtk.Arrow, but this is a
bit fuzzy:
http://imagepaste.nullnetwork.net/viewimage.php?id=3361
i'd like to use a more obvious representation and i thought of something
like that:
http://imagepaste.nullnetwork.net/viewimage.php?id=3360 .
but i dont really know how to implement sth like this. is it possible to
replace the text with a pixmap?

help and other suggestions are appreciated!
moritz