I did these 2 last week for a customer and used Colorburst LAVA thread. One of them has batting and flannel backing and the other has minkee backing and no batting. She did a great job piecing them and was happy with the quilting.
This same customer purchased a Pottery Barn bumper pad at Goodwill for $2. She took it apart and sewed it back together for a quilt. I echoed the shapes and did a squiggle around the blocks instead of SID due to the difference in fabrics.