I mixed a little dark blue paint(whatever paint) and some brown and washed that over the grey part, then a lighter version over the black parts, an off-white, yellow colour on the soles (washed, not really painted on with a brush or anything) and then finally some silver spots on the stripes.
and then misted them with grey, black and brown, wich kind of blends it all together and makes the silver look un-silver like, but gives the nice spotted effect they imo, should have.