ok great anew documet any size im using 400 X 125
than go filter>render>clouds
than creat a new layer brush the background i got this

than creat a new layer and brush thew hole left side with grung brushes use a new layer for each diff brush and when u use white try solft light to belnd it in. i got this

than add an image first cut it out than right click and go to free transform make it smaller and cop and thern paste it into you sig. than use the laso tool and select you pick right click and go feather 20px and than press CTRL+SHIFT+I and than press delete till u thinck pic looks good ig ot this

than under you pic layer go to layer>layeradjustment layer>colorbalance
i used these settings
Midtowns:-29 , -51 , +86
Shadows:-35 , -66 , +8
Hightowns: -91 , -46 , +38
you dont have to use that settings, thsi is what i got

now time to add soem text(pure showed me how to do this)
ok add some text on your sig exmpl your name on the froums than pres ctrl +J to duplicate you layer than go layer>layerstyle>blending options drop shadow and just press ok
than right clcik on your origan tyext(the one uder the one you just put drop shadow on) and go click rasterize layer than go to filter>blur>motion blur and play aroudn till you get a cool affect liek this

know to add a border(optional) creat a new layer on top press CTRL+A to select the image than right click and go to stroke use thes setting
color black
pixel1
inside
than press ok and go to layer>layerstyle>blending option on the first screen that pops up make fill opasity 0%
than go to color overlay and make the opacity 0 and color white
than go to stroke and make the size 1 and color black
than press ok and hit CTRL + H and there should be a cool little border i got this(might not show up with screen shot)

and your doen i hope you like thsi tuorial!
i made this tutorial becaus ei saw that there was no full sig tut in tutorial section so i hope it getsd put ion its not that great but it will help soem ppl out;)