Emerald on Ubuntu 14.04

I tried to install emerald twice in ubuntu 14.04. Both times I accidentally broke something with the window decorator and then only my desktop wallpaper was visible. On the third reinstall I did some googling and found a few people saying emerald doesn't work with ubuntu 14.04 because of conflicts with unity.

Is this correct? If so, is there another theme manager like emerald (in particular, I'm looking for a glass theme similar to windows 7 aero).