Advertising through Themes?

I’m sort of new to this Google Play market so I’m wondering if advertising through Go Launcher theme is possible.
If so, what kind of advertising network should I use?

I’m currently bringing in about 150~250 daily users a day.

I think you can provide a partial theme and ask to pay for the complete one.
I don’t see how you can integrate ads into a theme. It seems to me technically not possible.
Maybe it’s possible for live wallpaper.