Uranus and its six largest moons compared at their proper relative sizes and relative positions. From left to right: Puck, Miranda, Ariel, Umbriel, Titania, and Oberon
Because of the signs of water ice, one rather interesting(and difficult) theory is that terraforming Puck would involve creating a largely water-based biome. Puck is small enough that you wouldn't encounter any areas with high PSi(water pressure), but whether or not this is actually feasible is up for debate.
It is, however, abundant in minerals and it's been suggested that it would be a good candidate for early off-world mining.
