You customize your swift using a combination of the following accessories i.e.body cover, door visor, fog lamp, MAT,Boot Mat, Bumper Corner protector,Bluetooth, cushion, seat cover,navigation system, air inflator, air purifier, vaccum cleaner, reverse parking camera, reverse parking sensors,flocking, spoiler, remote locking,etc.
the site mentioned above provides the variants that these accessories are available for and the prices of each of these. Most of the accessories are available for all the four L,Z, Z+ and V variants.
There are certain accessories that may risk your warranty so please carefully evaluate the accessories that you finally choose for your car. I will list down a few accessories that I believe would go well:
Xenon lights (by philips)
leather or art leather seats (various companies out there, look for the quality in reviews)
floor and car trunk (dicky) mats (ATZ 5D)
air filter (by ALTECH)
Window visorv (by Auto Pearl)
Security system with Immobilizer (Viper, Hornet, Xenos, Silicon, Wheels)
Accessories that are good but may risk your warranty: