I just thought I'd mention that after using In Post Ads that it references images on wpmu.org via http...this is a problem if your website is on https as Im sure you are aware.
So I decided to change the CSS but there is no way to simply choose your own styles. There are preset styles and you can strip the default styles but this strips the wdca_custom_ad class that you kinda need to write your own CSS.
I ended up changing the plugins stylesheet, adding the stars image locally and then renaming the version number of the plugin so I dont update it by accident and lose all the changes Ive made.
I also found the wording/language used in the plugins admin to be on the confusing side.
Oh and for some reason I couldnt get the auto insertion working but the shortcodes work.