How can I make similar effects in objects like Minecraft and Mu Online?

Does anyone know how to make that chrome effect you can apply to objects?
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I don’t really know of any “chrome” effects in MineCraft, but if you’re referring to the animated textures on enchanted objects, you will need to animate the texture that you want to look like that, most likely with some kind of overlay over a static texture.

This will require a specialized shader. I strongly suggest you take a look at the Unify Community Wiki’s shaders page.

Once you have a shader that supports the extra texture, all you need to do is create a long texture that has the coloration you want to move around, and every so often, change the texture offset on the mesh slightly, so it gives the illusion of a pattern “flowing” over the material.