Looks good so far chris, try making the stone a bit less wavy, tone down the contrast one it.

I just made my first ever mob farmer in junt's server, I love it so far, it's 43x43 and i get a pretty decent dps, but i haven't really measured it yet.
edit: holy whale penis, minecraft just sold 1kk copies

Also, I've decided to start playing sp like i do smp, if you've seen my in smp you'll know that i basically get basic tools, THEN DIG TO THE BOTTOM OF THE EARTH within about 5 minutes. Then I usually don't ever surface unless I need ham, which i'll soon compensate for with wheat, then i can completely live in the ground :3