Transmogrifier

The Transmogrifier, often shortened to T-Mog, was a free program for creating custom objects for The Sims. It allowed players to clone objects, change an object's name, price, and description' and export or import an object's sprites. (In The Sims, objects were not rendered in 3D, but were composed of 2D images called "sprites" that were rendered isometrically.)

Documentation can still be found here. This includes the tutorial on how to recolor the flamingo lawn ornament green.