This staircase is inspired by the spiral staircase in the new set Pet Shop 10128
In the new set it is a spiral staircase based on a 1 x 4 plate.
(see e.g. this pic on
I experimented with different size plates
and came up with this staircase based on a 2 x 6 plate.
I decorated it with a colourfull carpet
and made convenient banisters/rails.