i just use the Spatter brush (One up the top with 59 px) and play around with my shape dynamics/scattering and smoothing settings
and i also use filters wave/ripple/spatter etc to get the extra effects
DAMN man your work is CoooooooooOOOOOOOOOoooooooooL !
you really know how to deal with lighting and stuff
i liked the Last one it has a strong strange power lol
your wallpaper is great i cant wait to see your next stuff ....!