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Could I get a quick idea of how you do the wheels...?
Sure. I used photoshop and picked the circle/oval selection tool. Then I put the oval around the "face" of the wheel, then use the magic wand (?) to de-select the open black spaces between the spokes. Do this until you have only the parts you want to change the color of are selected. Last, I used the Brightness/Contrast adjustment to decrease the brightness, and also decrease the contrast. I'm not an expert so there may be a better way to do it. Hopefully that make sense...I'm just about to go to bed.