Texture storage

Hi guys I was after some advice about texture management. I am writing a small app and currently it stores up to 20 textures in an array though of course it is easy to make that larger. Geometry that uses these textures just contains a reference to the array element where the texture it uses resides...so the texture can be found instantly. However if I want to make things scalable and have an unlimited number of textures i need something dynamic. Obviously i could use a linked list, and i do this for my world objects, but i heard that binary search trees or even red-black trees are better for texture lookup beacuse traversal is so fast. I was wondering what professional programs, or what you use for storing your textures, and what you would recommend. Thanks in advance