These are tileable patterns meant to mimic or copy the original patterns from the console games Splatoon 1 and 2.
I recommend you mess around with the angle of the pattern to get it closer to how you like it.
To apply the pattern well, I recommend you place it on a dark or light grey background and set the pattern layer mode to soft light.
If you want it colored, go to layer styles and change the color to your desire!
I hope they serve you well!
Splatoon patterns