If you can't find a graph pattern of your crest you can always go to
http://www.darklilac.com/upload.jsp
This is a site that can generate color cross-stitch charts from an uploaded image! I tried a relatively uncomplicated image (college crest) and it spewed out a wonderful chart with 64 colors to use. You can set a limit for the number of colors (I picked 100) you are willing to incorporate. It basically changes the pixels into stitch squares, but more importantly it matches the HTML color to the DMC floss color.
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