I haven't done anything to my truck, but I have a lot to do to it! I have a 2001 Chevy Silverado that belonged to my Dad. When he died my Mom gave it to me. I've already put about $3500 worth of mechanical work in it. My parent's had a gravel driveway, and the moisture did a lot of damage to the undercarriage. Now that I have a lot of the major stuff done, I'm looking to fix up the body.
About the only aftermarket accessories my truck has is some seat covers and floor mats with dragons on them. I would love to swap out the stereo at some point but because of the way it is set up I am not sure that I can.
I added some graphics that I had made up. I also installed some lighting along the running boards so the underside of the pickup is lit up. And I just ordered a bull horn grill to install along the front.
I haven't done anything major but I do change my floor mats in the winter and I have a furry steering wheel cover that I also put on in the winter. Oh and I put on license plate covers to protect my personalized license plates.
I don't really have anything added on my car other than a GPS system. I would love to either get seat covers and floor mats or see if someone can get them clean. I have a large crack in my bumper that needs to be fixed. Something flew up and hit it when I was on the highway.
I changed my floor mats and added some of those roller-ball car seat covers to the front seats for comfort in the summer. I also rigged up a small portable table in the back for the children to use for playing games and coloring when we're heading to the beach.