Thinking out loud here............I've seen rows of half hexies put together to make whole hexagons. With the fabrics you've chosen, you could design a beautiful "night quilt". But you'd have to lay out the pieces for your best sky presentation. And then follow up in an established order. The piecing wouldn't be that intimidating-----------arranging the pieces would be a job for a designing eye, however.
And the half hexies could be made big enough that you'd not need tons of pieces.