this is not really a tut more of a "make your own brush" type of thing im still working out the details but this is what i have so-far make the brush the settings for the brush is...Diameter-30,Hardness 17, Spacing 999 (no lower than 900 in my opinion ^_^ ) The Angle is 32 and roundness is 12 right now it does not work for rain effect im curently trying to fix it but if you use tihs brush and use difrent filters you can amke yourself a decent bg
ya your right it stinks try using the brush though with a blur effect and you can make some decent bg's