I made gifts for some my son's teachers. Because we all know how tough it is to teach middle school.
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I printed the reverse of the images onto embroidery stabilizer. The stabilizer has a sticky side so I stuck it onto the back side of a towel and then held it up to a light (either the window or a plastic box with a flashlight inside) and traced the lines with a Sharpie pen.
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The more detail in the image, the more difficult it is. Also, if there are words, don't forget to reverse the image before you print it.