yep, ive gone for yellow led indicator bulbs, from my primary school knowledge of primary colours red + yellow = orange
for a quicky how to:
buy a whole set of lights to play with, then if you mess it up you can still drive round
using a junior hacksaw gently go around the small gap between the lens and bulb holder, just enough to remove all the adhesive, but without going all the way through.
then, at the 'bottom' of each lens, (marked by a small indent on the lens) in between the bulb holder and lens saw enough away with the hacksaw to get the tip of a small flat blade screwdriver in.
soak the edge of the lens, where it meets the bulb holder in autoglym or similar tar and glue remover, to get rid of any adhesive the hacksaw blade hasnt cleared, then after a few mins, starting at the bottom gently prise the lens and bulb holder apart.
swap the red lenses onto the holder for indicator and fog / reverse, stick with black mastick or similar, make sure its a watertight seal as well.
leave to dry.
thats about it. obviously, ten yer old weathered plastic can be a little brittle, so you do take the chances of a lens cracking, in fact one of mine had a small crack before id even started, just be careful and take your time.
the foglight has a special bit of lens inside the bulbholder, i guess to make the light more concentrated, a clever so and so may use two fog light ones and have fogs on both sides.
im thinking about using some of those little led bolts (in white) to hold my rear plate on and to act as reverse, if i can be bothered!!!!
im also tempted to try to fit a set of pfoe's led lights under some oe red lenses all round, for the best of both worlds, but i'll leave that one for a while