Maggie, way back in the 70s I has 2 jigsaws - one was a tiny little earth in the blackness of space, the other showed the Saturn rocket starting to launch against deep blue, the gases were cropped out, but I can't find the image. Each had more background than colour, & I only made them once - it took forever to fit in each black piece (they were all the same shape) as the black was a lot more than 30%, however the rocket was "only" a third of that puzzle!!