It's a Plus cushion cover, back of quilting, originally uploaded by Hazelnutgirl.
I've just quilted the plus cushion cover and am very taken with the back of the piece! I half wish I'd kept the bobbin colour the same throughout, but the dark wasn't working with the lighter colours I switched to part way through. I'm tempted to do something like this on plain fabric...very tempted! It'd be a butt-load of lines to draw though (innate laziness battling artistic urges)
*I doubt I can keep this whole plus thing up for long, but will milk it as much as I can!