They're called bias tape. Bias tape is made by cutting strips of fabric cut diagonal to the grain of the fabric, folding the edges over so the cut edges won't show, and sewing it on. For the lines on the front, where both sides show, you would want single fold bias tape; it just gets laid down like ribbon. For borders around the edge of a piece, you want double fold bias tape; it's twice as wide as single fold, and gets sewn on so it encases the edge.
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Last edited by ChilmarkGryphon : 01-13-2011 at 04:33 PM.
Reason: lol I can spell