Instructions
Launch Second Life.
Maneuver your character so that you are facing the side of the object to which you want to apply the texture.
Click the "Inventory" icon at the left side of the Second Life window. Navigate to the first texture you want to apply to an object and drag it to the object at which your character is looking.
Position your character to look at a different side of the object to which you wish to apply another texture.
Click the "Inventory" icon at the left side of the screen again. Browse to your second texture and drag it to the second object side.
Repeat the process of correctly positioning your character, selecting a texture and dragging it to an object until your customization is complete.