Google "Images Grandmothers Flower Garden Quilts" ~ you will see all kinds of ways that people have finished them off. Maybe that will give you inspiration. Here are 2 pictures that i have of how i finished off my aunt's quilt. I cut the sides straight and added the 3 borders. I did get the inspiration from looking at the pictures. BTW - it did about kill me to cut/straighten the edges, but i really like how the border came out. You'd never know it was added 50 yrs later.
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