Back when I sewed regularly, I seldom used printed fabrics. Partly it was because I mostly made outfits for the SCA, where prints were rarely appropriate, but mainly because most of the designs available then were dull and uninteresting.
That is no longer the case. I recently visited Spoonflower.com and found all kinds of interesting things there, such as the plumbing nightmare above, based on the space-filling Hilbert curve.
Other designs include:
Très Riches Heures du Duc de Berry
You can also upload your own designs.
There is a catch: none of this is cheap. The least expensive fabric option is $17.50/yard. Should I ever get my sewing machine fixed, Spoonflower fabric would be for occasional special projects only.
I can easily spend too much money on Spoonflower so I rarely go there.
But I really like that Escher-tiles one. And the soot-sprites.