Daz3D, Free software, i buy the products when they are on offer, but the best way to change the look as everyone else buys also , is to take the skin textures, the textures of the clothing or any other part and take it in to Photoshop where you can replace the textures or adjust the colors or what ever, then save that file in the same folder with the original so you don't loose the original texture. Then go back in to DAZ3D and apply that new texture to what ever it is your changing whether it be clothing or skin textures or wood, steel, metals or what ever texture you want.
There quite a lot of shaders on there you can buy to apply those as well, the products from one package can be used on other products, so you can change the look and feel of what you making, and make it your own original. Take a look at the site, there is plenty in the gallery to see how people use the products.