I don't know why you even need new rock textures. There's like 1 million great tf2 rocks to choose from. Grey ones just like the ones you tried to create there.
Where? Because I certainly can't find them.
Lets see, we have:
coalmines/rockwall012 which is the wrong color
16 blend textures that blend between a "rock" texture I can't find singly and some ground textures. I'm already using the
one that is the right color (nature/blendrockgroundwallforest).
nature/rockwall001
Through
nature/rockwall013
All of which are the wrong color (brown/red) and some that don't tile vertically
Two textures from the swamp pack ("Karst_rock" which while it has very nice looking props, I have been unable to make use of them due to their size) one of which doesn't tile vertically.
and
winter/rockwall014
Which doesn't tile vertically.
The only two I
might be able to use are nature/rockwall010b and nature/rockwall010c
Both of which look like HL2 textures.
1 "cave" texture (looks HL2ish).
And many "stone" textures which are not natural rock, but things constructed from rough stones.