To help our kindergarten class learn about 3D shapes, we used concrete objects that see in their everyday lives.  I gathered up items from our classroom, and home, for the children to learn the names of these shapes. I also had the wooden block of each shape to match the item.

I used:
rectangular prism – box of kleenex
sphere – balls of various sizes
cylinder – a can  of soup (can be a real one or one from the house centre)
                              cube – a square box, dice
                              pyramid – a toy pyramid
                              cone – an ice cream waffle cone

By using items the children see all the time, it gives them a concrete way of learning about a very abstract math topic.