I've got a set of textures I made for the PlanIt 3D Christmas give-away.  You might find a couple of them would work for you.

You can get them here

Here's a render of the first in the series....

They're all P6 procedural textures, so the whole package of 12 textures only weighs in at 145 KB zipped.

The liver is evil - It must be punished.