My suggestion has two parts. first get the supplies, a can or two of yellow spray paint, a piece of card board and a mask, to keep from getting high (unless this is part of the reason you´re doing it) and two, get down in there and place the piece of cardboard behind the pedals, put on the mask, then open the can of spray paint and start painting.
Seriously though...I don´t know of any company that re-does stock pedals in cars to give them more flair...but there´s lots of stuff I don´t know. I have a set of grey and black custom pedals on mine right now, although I took the brake off cause it kept slipping towards my gas pedal. I want to get some red ones sooner or later. As far as I know the slip ons are the only way to make the pedals look better.

Seriously though...I don´t know of any company that re-does stock pedals in cars to give them more flair...but there´s lots of stuff I don´t know. I have a set of grey and black custom pedals on mine right now, although I took the brake off cause it kept slipping towards my gas pedal. I want to get some red ones sooner or later. As far as I know the slip ons are the only way to make the pedals look better.