Calling all machine-quilting experts: I have made many quilt tops, but now I'd like to try machine quilting the quilt pictured here (front = fused appliques outlined in feather stitch, back has the words Red Shoe Dog on it). For my first-time effort I would like to stitch wavy horizontal lines. My questions are: what color thread do I use? I would prefer not to use invisible thread as this is a baby quilt. If I use wavy horizontal lines, do I stitch right over the appliques or do I stop at the edge of each applique? This pattern is from the book Quilt Baby. Thanks for any and all advice for my novice attempt.