For something different, the pods can all be joined together to form a sort of interstellar train, effectively turning it into a whole new playset. Other accessories include a spaceship, a satellite, ...
From Black Seas Barracuda to Galaxy Commander, these are some of the most iconic and valuable LEGO sets of the 1980s.
You can build a telescope, a microscope and a UFO with the Lego Creator 3-in-1 Space Exploration Telescope review, but I'd only bother with the former.