Simple task if you are going to run from an SD card. Simply pop card in a USB reader and using Win32diskimager simply use read and copy the image to your hard drive. Then use write to put it on each SD card. It will make an identical copy.
Whether it will run when you place the card and boot in a new Nook is something I haven't tried but it should be fine. I use this method to back up mine to different SD cards when I want to try out a different ROM.