Constraints really breed creativity. The demoscene is probably my favorite example of it.
Real beauty comes from expressing something coherent within constraints such that the constraints become the means of expression.
Instead of the usual hideous red, black, grey and white that seemed ubiquitous since at least the 80s along with the most terrible textures one could find, there was blue, yellow, different shades of green.
And one painting featuring an exchange of text messages.