The small retainer wall blocks for landscaping are called "link blocks". They come in a couple of sizes, depending on the brand you buy, and normally cost around $2 to $4 each. On the last house I built I used to larger blocks, but on this house I decided to use the smaller blocks.
These were used across the back garden wall. They were cemented on top of a layer of cement forming a level area. This was needed due to the odd shapes of the large sandstone blocks.

The retainer wall closer to the shed area needed to be 2 levels in height. The block colours were chosen to represent the darker colour blue to match the roof tile colour of the house, and the lighter sandstone colour to more closely matcht he colour of the house bricks.

The front of the house used the majority of the link blocks to form a front fence and curved garden egdes.

All of the bottom row of link blocks were cemented to the ground.

Crusher dust was used to help form a compacted, non-organic base for the cement foundations.

The front fence are used the lighter colour link blocks for the lower layers and only the blue coloured link blocks for the top layer.

The front garden formed a fence, curved garden edges and also a small elliptical garden with a rock centrepiece. How far did we have to go to find this amazing rock... it was dragged up from the back of the property when the bobcat was cleaning the block. So instead of throwing it away, we decided to use it in the garden. It has been cemented in to prevent it falling over in bad weather or due to children climbing over it etc...

Another view of the letterbox garden.

This means the letterbox is still viewable with the curved garden surrounding it. Another advantage of the smaller link blocks is the tighter/smaller turning circle of the link blocks.

The tighter turning circle also meant the central curved garden could fit in easy as well.

The gardens were filled with premium garden soil before adding plants.

The slopes between gardens should allow rainwater run off, but not become too steep. The front footpath has a slope out to the cement footpath as shown in the image below.
