A gas giant orbiting its parent star in the habitable zone could be a host to several moons. With sufficient mass and suitable chemical composition, those moons could potentially bear life. A lush jungle moon like the one seen here could potentially exist… But it would probably be much different to anything we could imagine!
Image manipulation by yours truly. Source images:
Gas giant – timbersavage90 @ deviantART
Planetary Rings – NASA/JPL/Space Science Institute
Forest Moon – digitalecho @ deviantART
Orange Moon – MistikFantasy @ deviantART
Moon 1 – Gregory H. Revera @ Wikimedia Commons
Moon 2 – NOAA @ WIkimedia Commons