For making large asteroid fields. Use the blocks of rocks to layer up your own asteroid field. Easy to move the blocks into place and then delete the roof tiles....

A shop hovering in space? No just optical tricks. Use xyz placement and line up the building next to a straight bit of path, the shops autopath will do the rest, just move building until shop path is hidden by the space floor....

A big ball of space. Techincally not a sphere as had to cut away the tops and bottoms to make it below 4k, but it will give you the impression of being in space. The diameter is about 50m....