Some days I play in my craft room (other halfs office) and not produce any completed creations. That does not mean that I have not achieved anything or lost my mojo. It just means that I have played with my stamps and colours gaining ideas to make cards.
Sometimes I choose a card to CASe from Pintrest or Facebook, normally creating the card exactly first. Then I explore what else in my stash I could use on the card. Sometime I use inspiration from the Global Design project.
I have realised that just because nothing is finished doesn't mean that I have wasted my time in the craftroom. I have used my time to learn, Playing is a necessity not a luxury.