When creating the background of your mosaic more thought should be given to it that simple sticking your tiles down in a brickwork or grid pattern (like in the fish mosaic below).
Consideration should be paid to the colour choice of the tiles and the placement of the tiles. To help you with planning your background here are some points to think about:The choice of background colours is really important
Creating movement through the placement of your tiles will enhance your mosaic
Using the placement of tiles to create movement brings energy and life to your mosaic, and can also provides balance between the foreground and background. This is known as andamento, which is the visual flow and direction of your mosaic.
Consider how movement has been created in the following mosaics which have been created by Cooma TAFE (and on display in Cooma, NSW).