Our young three's are still at the stage where lathering on paste is their bliss, so they loved having a big canvas for their gluey pursuits.
Our older children were more considered in their placement of the materials, and we were able to talk about how the object of a mosaic is to stick the pieces as close together as possible and fill up the whole surface.
We have since added smaller bits and pieces to the mix, such as shells, buttons and beads: perfect for filling in the gaps.
When it is done I hope to hang it in one of the rooms, like these gorgeous mosaics created by Sherry and Donna's preschool children over at Irresistible Ideas for Play based Learning.
For more ideas on creating mosaics with children as young as toddler age, I can thoroughly recommend taking a look at Making Mosaics with Children Part 1 ::: Glittering Shards.