BE specific......maybe by stating your budget...
Putting kedai abang car sticker (add 20hp wor) oso upgrade (visual apect).
Mod engine kaw-kaw with gila HP oso upgrade. (performance aspect)
Put flower, teddy bear, etc in the car oso upgrade (comfy and cuteness aspect)
Put fake tiger skin upholstery oso upgrade ("uniqueness" aspect??)
Change tyre air valve (with NISMO words) oso upgrade.....
hahahaha...
Anyway, you need to be specific so bro here can help you better....