How big are those textures? And where did you get them? Did you port them yourself?
Got some of the interwebs. But I still nice to import ladder, water and lava texture.
I have some problems with the 'white' (no texture color) not being invisible.
It is a known bug in source SDK.
I'll try to import the creeper. Maybe a moving creeper? I am going to try make it blow up holes in the ground.
But than it needs to be static.
Also:
http://finniespin.tumblr.com/ some screenshots. And keeping you up-to-date.