Tons of things! Lemme give you a list with inspiration and ideas: Which means the original texture and/or mesh will be replaced by your own mesh and/or textures! What can you do with Default replacements?
It’s been around here since the sims 2, and maybe even the sims 1! It’s very hard not to know what it is, but if you have no idea what a default replacement is, well it’s a mesh or a texture that replaces the in-game textures or mesh. Tutorial: How to make a default replacement! What is a default replacement?