Are there scraps from any attendant's clothing? If you can get them, you could add those into your nine patches.
Before you cut it all up - for my daughter, I made the ring bearer's pillow from her dress scraps.
Next, I made the christening gown for her children's baptisms.
I'm still working on an anniversary (soon to be 10th!) quilt for them. Another UFO. Took a long time to decide on a pattern. I'm glad you already know what you want to do.
Can you tell I bought a lot of dress fabric to make sure I didn't run out for her dress? 8)