Butterflies get a guernsey on Birds in Backyards from time to time so he's my contribution of a Common Grass Blue Butterfly.
This species' favoured plants are members of the pea family FABACEAE such as Native Lilac Hardenbergia violacea, Tall Scurf-pea Cullen australasicum & Austral Indigo Indigofera australis. If these plant species are local to your area then I recommend planting some to attract this small, delicate butterfly. The Common Grass Blue is also attracted to the weed Scabious Scabiosa atropurpurea which is the flower in the photo.
The larvae of this species are attractive to birds.
We've got lots of these around at present :)