For the Grass mod you have to look in the RES GESTEA Subforum There you find a downloadlink and install instructions.
To Use the Cities you have to download RES GESTAE, look for the right Files and then copy and paste them into the right Place in your EB Folder. Then you have afaik to edit some textfiles to make the Cities appear in game for the right faction. (unfortunately i don't know which files to copy and which files to edit, you have to look for a tutorial in the scriptorium)
Since the new Cities are done for 1.5 and not for 1.2 they may not work anyway (not sure on this)...
I would suggest to wait for 0.8.....
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