Big-S did some wonderful work with geometric tiles. I bought these from here. They're transparent which seems to excite the children more. There are 15 shapes and they all fit together.
First she made her pattern from the tiles.
This is the pattern complete. It's beautiful :)
Next she used other tiles to trace her pattern onto paper.
She then covered her traced pattern with tracing paper and coloured in the tiles with felt-tip pens.
Her final piece of art!!! It was too good she had to take it home.