Bias applique is usually used when making leaf stems or vines. Any long thin curved appliqueed line can be made from bias strips of fabric pressed on bias bars. If you would like to purchase a set of bias bars, click here.
The vines in the quilt below are an example of bias applique. These vines were cut from the bias. In order for the fabric vine to lie flat in the curve, the vine must made from strips of fabric cut on the bias.