MegaGlests' game mods menu let's you install many new mods. Even more are available on the MegaGlest Wiki and the Mods forum.
If the model looks pink, that just means that it doesn't know where to find your texture. That's not a problem when you export it, though, because Glest always expects the texture to be in the same folder as the g3d. To get rid of the pinkness, go to your UV/Image window and change the location where the texture is supposed to be.