I finished the practice spider!
I think it looks great! I put a pic on Facebook and scared the living daylights out of quite a few people, so it must look realistic. I've got it hanging over the back of another pic in my lounge until I can find a frame for it, and it makes me jump when I first see it again.
I was planning on adding the official version to the quilt top before I began quilting, but now I'm thinking I should wait until I've finished the top, as the embroidery isn't as sturdy as I would like. I think it would survive, but it might get warped and I would hate to have ruined the whole thing.
So now I need to find a decent backing, make my mind up about a border, and get pinning again!