I have posted a video highlighting the BERNINA #21 foot as the perfect way to add cording to the edge of a project. Here is the link to the video on my You Tube Channel. Be sure to subscribe to the channel when you get there.
Here is a great way to create something simple that looks difficult.
This was created with a ready made shoe bag but the technique would be the same with yardage that you are going to incorporate into any project.