Welcome to the forum. Lots of members have done mods, from mild to wild.
However, most mods done are functional, rather than esthetic or performance based.
Most popular include rear bumper step plate, tint, remote start, homelink mirror, upgraded sound system, upsized tires (215/50-170), different wheels, Katskinz (?) leather interior, led interior lights, lighted door sills, front lip, headlight eyelids, HIDs, and a few have added lowering springs, performance shocks/struts, cold air intake or short ram intake. A very few have used parts from the Mazda Speed3 to make upgrades.
What has you mod experience been with previous vehicles?