You need to buy a set of lights that are cool, no heat. This video shows stitching circles on a wall hanging, then you cut out the hole & put the lights in. A pocket was sewn in lower corner to hold the battery pack.
https://www.youtube.com/watch?v=bHrgjqwCbDs
https://www.youtube.com/watch?v=W1KyuKQWqTU
Google for the Starry Night kits: Starry Night Wall Hanging Quilt Panel