Software for creating animated textures?

Miscellaneous Forums/Content Creation Tools/Software for creating animated textures?

Someone please help me out here, I need a program that can take multiple images and combine them into an 'animation strip' for use as an animated texture. I tried finding ways to do it manually but none of the programs on my PC allow me to edit images in the way I need. I'm sure there has to be programs to do this, something along the lines of ImagePacker only for single animation sequences...