Absolutely, you could do it a few ways including through the use of the "set material color" action. If you select the shader you want to use so that you can view its keywords in the inspector window, use that keyword in the "named color" part of the action, once that state is active it will change it to the colour you set. For example the particle shader I'm currently looking at has a "tint color" setting, the keyword for this would be "_TintColor".