The ROMS are all here, at xda-developer's forums: Droid Eris Android Development - xda-developers
Look for the threads that start [ROM]
Nonsensikal, since that's the one that you mention: [ROM|Final Release][12/17] Nonsensikal v16.1 [CM 6.1.1|Black&Blue|Vanilla] - xda-developers
You can download it to your computer if you wish, and copy to the SD card on the phone after tethering it if you wish. If you do download it to the phone, it will store the file in the /downloads directory - you need to move the file to the root directory of the SD Card, so you need to do that on a computer or with an app like Astro File Manager. If you download it to a PC, don't unzip the file that you download - just copy the .zip file to the root directory of your SD card. Amon's Recovery, the custom recovery image that will replace the stock recovery and which you use to flash ROMs, will only see the .zip files in the root directory.
Look for the threads that start [ROM]
Nonsensikal, since that's the one that you mention: [ROM|Final Release][12/17] Nonsensikal v16.1 [CM 6.1.1|Black&Blue|Vanilla] - xda-developers
You can download it to your computer if you wish, and copy to the SD card on the phone after tethering it if you wish. If you do download it to the phone, it will store the file in the /downloads directory - you need to move the file to the root directory of the SD Card, so you need to do that on a computer or with an app like Astro File Manager. If you download it to a PC, don't unzip the file that you download - just copy the .zip file to the root directory of your SD card. Amon's Recovery, the custom recovery image that will replace the stock recovery and which you use to flash ROMs, will only see the .zip files in the root directory.
)
) i flashed 4.1,and dint have the market or a couple other things until i flashed the gapps-mdpi-20101008-signed.zip mentioned about halfway thru it.

)