If your swapping out textures from the main BSA archives then you need no extra ESP or ESM for the game to load them as the def's are already in the main games master file (ESM). I have done this repeatedly with higher res textures from the PC version of the game and used them on the PS3 version as the PS3 version is capped at 720p but you can force the game to use 1080 textures, it looks quite awesome on the PS3 this way, or I have made and used my own textures.
Also with this game it loads and installs the texture's on demand, so it will first load them from the disc when entering an area you have not been to before or dungeon, then cache them on the HDD for later use, its called dynamic install.
So if you replacing them just in the cached HDD BSA and not in the BSA archive on the disc your going get issues.
Also black screen on Oblivion on PS3 means that the game cannot use the ESP/ or BSA+ESM you have just put there, and make sure any mods go in a folder named INSTALLEDDLC (if using the Game of the Year Edition that come with the DLC you must create this dir yourself in the HDD installed data folder in games ) and is in the same folder as DATA in the USRDIR folder.
Another quick note is that 8/10 you do not need to edit the INI file to load mods, most will load just by putting them in the right folder which I described above, and not all PC mods for this game will work on PS3.
As for the meshes... well if your adding extra one's that is not normally in the game without adding them to the ESM of the game will not work either, you will break the game as it has no idea what to do with them.
This is why mods come with ESM's (Elder Scroll Master File) to tell the game where they belong in the world but hey will be looking for the custom BSA archive that's hard coded in them.
ESP's (Elder Scrolls Plugin) are stand alone mods that don't normally come with BSA archives.