You can pack multiple images into a single texture map. This is called a "texture atlas." See here: http://en.wikipedia.org/wiki/Texture_atlas
Then, when rendering geometry (planes in this case), you reference sub-segments of the texture atlas to be drawn on your geometry using the appropriate UV coordinates. See this recent question: http://answers.unity3d.com/questions/154324/how-do-uvs-work.html
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