This is the page for colored 3/4” ceramic disc magnets from the PWB Electronics web page. Keep in mind these are only slightly magnetic. The real PWB Magnadiscs are treated but you can do pretty well with stock ceramic magnets. Just not as good as the real macaw! Metaphors be with you!
Timely tip, spray ceramic magnets first with white primer, then spray on color of your choice. That way you get good solid pure color magnets.
Another tip, PWB now has a universal Rainbow MagnaBlock that replaces all the colored ceramic discs. No fuss, no worry. Priced right! Buy a bunch!
http://pwbelectronics.co.uk/product/colouredmd/colouredmd.html