Embroidery by hand and machine can be used to embellish quilts a little or a lot.
This page has links to some tutorials by quilters who embroider and embroiders who may, or may not, quilt.
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by Sharon
who has a blog
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by
Mary Corbet
on
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by Susan Brubaker Knapp on her blog
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and
by Sandra Leichner
on her blog
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gives details of the variety of needles available for handwork and is on the blog
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Hand made or Machine Made Lace or Embroidery?
Article by Vincent on his blog