I'm cataloging them simply by background tuber colour, and eye colour. I will add any other characteristics or identifiers once I see the plants growing, along with any observations on their habit or productivity.
Pale creme, self-coloured eyes (aka 'White').
Pale creme, pink eyes (possible variation on right, pale creme, purple eyes)
Pale yellow/green, self-coloured eyes. The colour difference between this and 'pale creme' is not very obvious on-screen.
Pale gold, purple eyes.
Pale pink, purple eyes.
Rose, self-coloured eyes.
Pale red, white eyes. Source, a sport of Real Seeds 'Red'
Scarlet, white eyes (aka Real Seeds 'Red')
Dark scarlet, self-coloured eyes.
Orange-pink, purple eyes. Offspring of tubers bought in a UK supermarket eight years ago, so almost certainly a New Zealand commercial variety. Thanks to Catstripe for the tubers.
Ruby red, white eyes. Again, from tubers bought in a UK supermarket eight years ago, so almost certainly a New Zealand commercial variety. Again, from Catstripe.
Many of the varieties above are courtesy of tris0070 who provides Oca and other unusual tubers via eBay.