changing svg graphic attributes once rendered

[barrygp]

Is there a way to change the attributes (color, etc.) of a rendered svg graphic based on the state of attributes (i.e. is there a way to have an svg graphic attributes modified once rendered).?
Essentially I want to change colors, etc. based on the state of the system, however, the default grapphics will be displayed using svg.

Thanks very much,
new QT user.
--Greg