Yes indeed! Adding constraints really adds to the creative process! Here you have 10 minutes, create something, here you have only a field of grain, create something, here you have only one lens/camera, create something.
It's all nice and buzzwordy to "think outside the box", but sometimes it is just best to "reduce your box" :-D
!DIY
!HOPE
!PIZZA
!INDEED
!ALIVE
!BBH
!STRIDE
!DUO
!PIMP