Tile 6 and 7: Recreating a Pattern

I did this late into the night, and when I finished, I saw this pattern effect that I liked – that one in the top left hand corner.

I’ve tried to recreate it, with no success.  

So in the meantime, that’s what I’ve been obsessed with …  trying to find that pattern again …  No, this is nowhere what I had in mind … 

I still haven’t figured out the placement or the sequence of this pattern, but now I’ve got lots of new ideas to try …