It's possible in Blender to apply a sequence of images as a texture over time. This may not seem immediately practical but it offers a really economical method of mapping image textures at set times in an animation. It is particularly useful for creating changing signs, or hoardings that change over time. From traffic lights to airport arrival and departure boards, sequence textures is the way to go.
This recipe shows how to create a Red Alert sign worthy of any star trip universe.
This recipe requires a flattened cube and three texture images for the sequence. The cube should look something like that shown in the following image:
You will also need to create three identically sized images ...