Hello Ash, welcome to Torque Cars.
Firstly, your car is an extension of yourself, so don't let others influence you too much. You are the one that has to live with it, so you should be the one who is ultimately happy with it. Now to answer your question, I would say you can get an aftermarket exhaust. I would suggest not going too big, losing back pressure, etc. I am very picky with the sound I like from my cars (really deep, growl that's not overly loud, just deep). Although, its not so much look.
You can also do a tuneup, changing the plug wires (to match or accent your car color and air filter), aftermarket shift knob, aftermarket dash panels, speaker covers (and speakers), new head unit, aftermarket pedals, etc. The list can be very extensive. It's limited by your imagination. I had a 1972 Datsun 240z that I used to deliver pizza with for a short time (I hated doing that to my car), but made an engine cut off (wired the ignition into a switch) so IF someone tried to steal my car and IF they knew how to drive a manual, they would not know how to start the car. It also looked really cool.
You can use the same concept for subwoofers if you are into bass, lights, etc. I'm rather minimalist, but as I said.... the car is an extension of you.