I'd leave them as they are because with the chrome painted black you will lose the illusion of a larger wheel.
The black will blend in with the tyre making the rim look smaller.
Could do the spokes black thou n leave the chrome,just my thoughts...
I agree with the above as I think Lm look small as they are becase you have a thick dish giving the illusion that the rim is smaller than they are opposed to a rim with spokes running all the way to the edge.
I have also thought about having mine done one colour, but only to cover some of the corrosion on the rim and I'd go silver. At the end of the day your car your choice. I think they'd look ok.
I have many 'to do jobs' including colour coding,tints,flyeyes etc.I have always been adamont im no lowering as ive done this in the past but found it abit harsh for my age lol.....................im now slightly considering lowering it