I completely randomly stumbled upon two inhabited planets in the same (dual sun) system. I wasn't looking for anything really, just flying around hoping not to crash.
This one's cool, with a dense atmosphere, red rocks and rather standard green plant life.
This one's a bit colder - and with an even more dense and unfriendly atmosphere. However, the kind of lifeforms here are rather interesting... they're all purple, so this stuff might not be carbon-oxygen after all.
Surface (I really like mountains next to ocean shores)
Night sky (badass red tint)
Those places look like complete opposites of each other... I smell a sci-fi conflict brewing here once they evolve some sentience.