Yeah the pattern is not great, but I have very little control there, as the there are 4 different squares that can be in any order, any direction, mirrored, so any given border can be next to any other 32 other border.
The only 2 solutions:
1) making the border pretty uniform (partially what I did with desert patterns) but it creates an unnatural pattern.
2) adding a lot of noise, but that mainly works with noisy textures like grass or sand.
Unfortunately, making it an option is not an option, as you can't change individual files inside p0data3. But if there's a popular demand for static seas, I'll make an optional download or making it even more subtle.