Found this about plastic bottle tops

It is difficult to recover small, loose bottle tops from mixed kerbside recycling with sorting technology currently used in Materials Recycling Facilities (MRFs). However, technology is always improving, and we may be able to sort bottle tops more efficiently in the future.

Bottle tops and lids must always be removed from any bottle or container you place in your recycling bin. Bottle tops and lids larger than the size of a business card (eg. lids from jam jars) are much easier to sort, and can be placed in recycling bins, provided they are separated from the bottle or container.
At this time, plastic bottle tops smaller than the size of a business card should not be placed in recycling bins, but steel and aluminium bottle tops can be recycled if you follow the directions below.

Bottle tops are too small to get collected in the sorting process, but if placed in a can of the same metal type they will get collected for melting with the appropriate material. To present these bottle tops for recycling you need to:
  1. Wash the bottle tops to remove any food residue
  2. Place the clean bottle tops inside a can of similar material – if a magnet sticks to it, it is steel – if not, it is aluminium.
  3. Squeeze the can to close it so the bottle tops don’t fall out
  4. Put the can in the correct recycling bin
The steel and aluminium from bottle tops can be turned into street signs, car parts and new bottle tops.

I found this article for someone in Canberra who recycles plastic lids into prosthetic arms and hands for kids. It's called Lids for Kids

Trying to see if I can get some more contact details. Would be great if all our local schools were collection points for Brisbane...