Glad you asked...
You could use Jello and some other items to make a 3-D cell. Line a container with a plastic bag to the represent the cell membrane. Fill the container with Jello. Use a ball for the nucleus, mandarin oranges for the mitochondria, jelly beans for chloroplasts, etc. Here are some more detailed instructions. http://www.wikihow.com/Build-3D-Models-o...
Then again, this answer might help you...
Building an animal cell model is not very difficult. You can build it with the help of box cutters, knife, ruler, scissor, cardboard, moulding clay, toothpicks etc.

