What to plant in this space?

Our townhouse lounge room windows look out to this fence, and it is quite a sparse view. We are hoping to add some greenery in between the path and the fence (17cm wide) to add colour and present better.

The neighbours have plants growing on the other side of the fence, so presuming we can grow something here.

Any recommendations for plants that would thrive in this narrow space and reach a decent height? We live in Brisbane.