I am making my step-daughter a t-shirt quilt with t-shirts from concerts she has attended. Due to the large size of the entertainers pictures I had to make the blocks 18"x20" and it is a queen size quilt. I used a heavy stabilizer due to the size of the blocks. I am using Nature-Fil batting of 50% rayon from bamboo and 50% organic cotton and the backing is 100% cotton. I sewed the blocks together using a ball point needle. My question is what needle do I use to do the FMQ? Do I use a ball point or the usual needle for FMQ? What size needle would you recommend?