Christmas Card - accordian style
Is it easy enough for kids to make?:
yes

On the left you can see the finished card.
First get some black cardboard, and stick some white paper on one side.
Then cut the cardboard (and paper) into a long tapering rectangle.
To make a nice section to fold the card closed, clip a small triangle off the smaller end. This will be folded over the end.
Fold the card like an accordian, with each fold the same width.
Used a star-shaped hole-punch to cut through the cardboard (and paper) on the last fold - the white paper underneath will show through.
You can write on the white paper, with a separate message on each fold if desired.

