If it is sewed together, make what you have into the center. Then completely surround it by sewing on a border of the zigzag twists, try one, then a second one. (one of them the same color of pinks) then sew an applique vine border all the way around that.
If you want more borders to make it large enough, use strips of pink blocks and/or a strip of plain green.
I hope this gives you some ideas! It is a lovely interesting start!