We used the "whale" previously made for Jonah. It is made by taping plastic sheeting together and attaching it to a box fan. We used a large ball covered in white newsprint for the stone.
We took turns wrapping a kid in a shroud of white sheets (not covering the face) and laying him or her in the tomb. Then everyone on the outside shouted "Alleluia! Christ is risen," as a cue for kids to try and unwrap themselves and exit the tomb. We had a stopwatch to see who had the best time.
Lisa