just use blending options, (or google for that matter lol) but just right click on the layers your flattened image and use outer shading and you can play with it a lot. width, depth, darkness, color, fade, etc.
if that doesn't help you can ask again here but I suggest sharpening up on your google skills a bit
2002 Red Mazda B2300
Short Cab, Short Bed, Pioneer sound system:
DEH-P5100UB deck, dual USB/aux inputs, single CD, organic display, remote
4 TS-A6872R 40 watt nominal speakers
2 TS-SW2501S4 250 watt nominal 10" subwoofers