I took the pop-up tent and covered it with black tablecloths I have on hand. You could use plastic ones from the dollar store if you don't have these or dark sheets.
I made 2 giant eyes out of felt. The felt sticks to cloth, so if you do have sheets or tablecloths, it is easy to put together.
I made my original tongue out of red tissue paper. This time around, I added red wrapping paper we had on hand.
I made a tail by twisting a rectangular piece of black cloth and taping it to the wall with black duck tape. I hung "seaweed" inside of the fish - just green crepe paper taped to the tent seams.
For an added effect, I covered the wall directly behind the fish with blue paper and some fish we had left from Bible school.
DIY Giant Fish for Jonah from Joan Eppehimer on Vimeo.
I wrote a simple drama based on the book of Jonah. You can access that here.
We added a ticket counter (the window in our unfinished stage) and signs for the "city gates" of Nineveh to create a little atmosphere. Here's the link for my signs.