[ubuntu] Need Help With Themes

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http://ubuntuforums.org – I'm running ubuntu 12.04 and for the life of me I am not able to install any properly working gtk+ themes! I am able to install them so that they show up in the tweak tool, yet they're all not working...right. Like the color of the font will be really light and everything just generally does not look like the preview. I'm using Gnome-Shell, and I'm able to install and use shell themes just fine, it's the gtk ones that do not work. Also, I have not been able to change my icons at all, nor my cursor. I've installed both of them into the /usr/share/icons through nautilus AND in /home/stardus (Hardware)