Well if you deleted them completely then there is no way to restore them, unless you did a back up with Titanium before you removed them. But first lets see if that ROM is still on your SD card and then we can go for there.
Open up Astro,
Click on "SD Card Usage"
Look for the folder labeled "clockworkmod"
In there should be a ROM or downloads folder so look in there for it.
If you did not use ROM Manager to download it originally then look for the "Downloads" folder instead of the "clockworkmod" one.