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To be honest, I don't really think the textures need animating with noise (or anything of the like). At most, they could perhaps have a shine gloss over them or something.
If you wanted my PSD from before, here it is btw:
As for your query about the repeater/comparator, you can find those textures in the vanilla resource pack under /assets/minecraft/textures/blocks/repeater_off.png, repeater_on.png, etc. You won't be able to directly copy those (violation of the license), but they look like fairly easy textures to re-draw and alter for this mod.