So this challenge was to move away from the Zentangle norms of black pen on white paper, and to use blue in your tile.
I used blue pen (not that you can really tell from this pic) on bright blue paper. Notice once more, the lack of shading!
I think I was also inspired by one of the previous challenges, as I left quite a lot of space in this tile!
Tangles: Bales, SeZ, Baton, Flukes