You would do it the same way as you do a scallop border.
Sew on a regular straight border a bit wider than you want your waves.
You can either freehand draw the wave down the border or make a template and use it to trace it around the entire border.
Depends on if you want it to flow perfectly evenly down the sides and around corners (like scallops, which are most always precise in number and placement), or are looking for a more non-traditional, free-form look.
You can do the drawing of the waves before or after the quilt is basted.
I use 505 to baste and it makes a pretty stiff surface - I'd probably do it after it's basted (even though quilts are traditionally marked before).
Personal choice.
Quilt the top however you planned.
THEN you trim the quilt top and apply the (bias) binding.
Trimming the border beforehand will just make it a nightmare to quilt - either on a domestic or LA machine.
Sounds like a great idea .
I just might borrow it.
I hope you post a picture when you're done.
Last edited by MTS; 09-17-2012 at 05:55 AM.