Just don't delete the original image that is on your camera roll. The folders/albums are just to organize.
Try it out
snap a picture, create an album and move image into it...it's entertaining how they fly onto the album
watch what happens when you delete the original image from the camera roll.... Poof it disappears from the album as well... gone forever
Sooo don't delete the original images. Think of them as a backup when you place copies into your new albums!