Tiny Land's famous Rainbow 8 set!  Creates a beautiful range for stackers, blocks, pegs rings, rainbow rice - there are so many ideas!
You can upgrade to a 12 Rainbow set by buying the 4 Upgrade set also on the Australian page.
Colours in the 8 set are as per the rings in the image by @Heirloom Rainbow:
Strawberry Red, Orange, Sunshine Yellow, Grass Green, Sky Blue, Royal Blue, Purple, Hot Pink
$111 AUD shipping included.