I was browsing the Nexus today for spider mods. And I've only seen spider replacers and retextures. However, this is not what I was looking for.

Seriously, I have no idea if anyone can pull this off. But I'm requesting wall crawling spiders. Whenever a creature is severely wounded it flees, but the skyrim spiders can only walk the ground. They should flee to the walls and crawl up, back into their funnels. This should make for some interesting encounters as well.

And perhaps web on the ground in forested areas. As soon as you step on it, it should slow you down drastically and attract a spider. Oh, and they shouldn't make any noise. No sound at all actually. Any spider would starve if they were as loud as frostbite spiders.

I've seen the spiders climb up some small walls before, but I'm not sure if it'd be possible to get them to re-enter their tunnels - those appear to be designed to be one way, and I'm not sure the spiders could be made to walk on ceilings.