I tried to answer your PM, and my message was too long...
"well,i use a black splatter brush then some black grundge brushes on the backround,duplicate it,then guassian blur it by 10 px...
then new layer,radial gradient with a color that is from the render and black ^^
then play with the layer modes til i find a result that i like,then go from there ^^
heres my newest ^^
ps:how to u use c4d's ,and do u gots any i can use o_O"
"I guess that could be a good grungey method, but your result is too dark and contrasted with the red, I'd say try not to use brushes unless using them to create a clip mask effect, Don't lower the opacity of the render, or erase parts of him, try smudging the background onto him, or smudge him into the background, as for text, Keep it small and simple, choose a color from the background/render and use a small font and just write whatever, and place it near the shoulder.
They are c4ds with particles and random lines on a black background, when set to "screen" the black disappears leaving only the particles and lines, making some good effects. These c4d's are good for adding onto flow, not creating flow.
used for backgrounds and for creating flow. set this to normal, and if a part don't look good, smudge it out.
same as normal c4d's, 'cept you set it to multiply or screen, depends which color you want it to be.
Wow, long post here. :P"