Silver headlights lights to
Black Headlights
Silver Headlights
to
Black Headlights
Changing the Grill for either a Colour coded outer to match the bodywork or changing the whole item for a Dimma style badgeless item
Standard Grill
to a Standard grill with
Colour coded outer
or
Dimma style Badgeless grill
Another easy thing to do is to colour code the lower lip spoiler on your front bumper
Back lights are a easy option as well, best to avoid Lexus lights these days as they look cheap and tacky. These are Ultra Smoked Jewls considered by most to be the best aftermarket lights for the saxo.
Standard Phase2 Rears
to
Ultra Smoked Jewls
As for prices, well, Headlights can be done yourself or bought new for around £130ish, you can colour coded your grill yourself or find a item off a Desire model (I think) as they came with a colour coded outer grill, Dimma grills are about £30-£50, the lower lip spoiler can be done yourself and rear lights I paid £70 for my Ultra Smoked Jewls but I know people have paid less.
Like mentioned before trimming down the areal, a 206 item or plain removing it altogether can improve the look of the car.
Saxos are best suited to simple mods and best keep classy and decluttered if possible, steer clear of cheap and nasty chrome bolt on bits from Halfords and your be fine