My vote is for no sashing.
Crazy quilts remind me of my grandmother. She made her blocks about 12" square, sewing the pieces of fabric by hand onto a foundation made from an old sheet. She used black feather stitch embroidery between the pieces. She sewed the blocks together by machine, then put the black feather stitch over the seams. Always quilted them in straight lines about 2" apart (by hand). My mother wouldn't let us sit on her bed when she used her crazy quilt that grandma made. Even so, the embroidery wore out long before the quilt did.
It takes a real talent to put together the crazy patch block! Not everyone can do it. You did great!