/diy/ - Do It Yourself

Are there any other weeaboos that are familiar with Sashiko? Been looking into it for use in quilting squares. While there seems to be a variant/style for doing simple patterns on quilts/patchwork, the patterns I come across seem to come in the form of single squares of white fabric with a pattern on them to stitch to. Then the pattern is washed away. The problem is, what if I want to use a pattern on different colored cloth?

I guess doing my own patterns might be a thing too? Unless trying to do these with a batting backing would drive me nutty.