I sleep under a quilt like that (stamped and then hand embroidered and hand quilted). It was made by my aunt over 30 years ago and has been machine washed a million times and the blue dots are still there. Yes, they still make blocks that you can hand embroider and they are done with a turquoise dye - so don't know if they are permanent or not.
This quilt is SO SOFT - and I absolutely love it knowing that my dear aunt made it by her own hands.