Need pieced border ideas

[Neher-in-law5]

This is the center to a wedding gift quilt for my niece. Right now it is 58 inches but needs to grow to between 95-100 inches. The diamonds are 16 inches from tip to tip and 6 from side points. I have more of all the fabrics but would like to do something quick and easy but still have it look like it goes with the center instead of just an add-on. Triangles and curves don't bother me.

Of course the shower and wedding are this coming weekend!1 The 23, and 24. She will get a preview at the shower and then I will quilt it after the wedding. There is only so much time available and I have my kids from both coasts coming. I plan to enjoy time with them and the 3 grands.

Thanks for the ideas.