you can put all the individual textures into one big super texture and use the UV coordinates in the vertices that make up the tiles to map into 'parts' this big texture
*Cough* .. ImagePacker will do this for you.
Just throw all of your images into ImagePacker and save the 'pack'. The saved pack will have an associated definitions file containing the details of each image stored in the pack such as name, x, y, width, height, and animation setting.
You can also generate Blitz code to display all of the images using a single-surface quad system (SpriteMaster) or regular 2d images (ImageMaster).
See this thread for more info: Image Packer