How many borders do you want?
I like 3.
1.The inner border is the same as the background fabric and is about 3-4 inches wide.
2. The middle border is the framing border and is the darkest color used in the quilt. Cut about 2 inches makes a 1 1/2 border.
3. The outer border can be quite varied. It can have piecing in it or be plain or be scalloped. I like a medium to dark, but not as dark as the framing border.
When I put them on..(Now this is just my opinion and there is no Gospel here), I like to alternate the sequence.
Inner border put on sides first, then framing border top and bottom first, then outer one sides first. If you do not do this, then your corners are weaker, (I think). By alternating you don't get the stacked effect.
Marcia