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I highly recommend https://www.textures.com/. You can keep your cube primitives and retexture them with stuff from there, and you'll have a lot more variety. I use a bunch of their stuff in my own game.
One of the tricks I use on a lot of my materials is overlaying another texture at a different scale to break up the repetition. It gives great results for minimal effort.
One of the tricks I use on a lot of my materials is overlaying another texture at a different scale to break up the repetition. It gives great results for minimal effort.