I saw someone on Simply Quilts do this years ago. She used this stitch, as well as some others, to outline specific parts of flowers and leaves. It made them look much more realistic. She did it on a fun, jazzy looking quilt also, where it looked awesome (like Jacobean appliqué). I think it's a wonderful stitch. One can really outline appliqué with any cool/nice looking stitch and it gives the entire quilt more interest. I've seen some interesting, beautiful tops while longarming!
Good for Barbara for figuring this one out :)