If you gave the buttons on the left a chance, you are now probably used to having them there and most Emerald themes come with the minimize, maximize and close buttons on the right.
Here's a quick tip for moving the minimize, maximize and close buttons on the left for an Emerald theme:
Open the Emerald Theme Manager (System > Preferences > Emerald Theme Manager), click "Edit themes", then go to the Titlebar tab and under "Title-bar object layout" on the right, you should be able to select "CNX:IT:HM:OSX Layout" from the drop-down. In case this is not there, simply copy/paste it.
If you don't want a window title (like for the LittleGrass Emerald theme), use the following code: "CNX:::OSX Layout". You can of course tweak the layout some more as all these parameters are documented under the "Title-bar object layout" option.
Post idea thanks to kv1dr