Look at this smooth experimental navigation menu using SVG by Steve Gardner, it has 3 layers what looks like a wavey ribbon and the navigation menu appears in there. This can work well on a website that is looking to implement an out of the box design.
If you are having trouble with the pen, try the archived copy on GitHub
Smooth Ribbon Menu Snippet
See the Pen Ribbon Navigation by Steve Gardner (@steveg3003) on CodePen.0