This circuit:
http://www.siliconchip.com.au/cms/A_103277/article.html

It came in a kit with the parts.

I'm not colour blind, but the different colours have a very similar quality (tone? hue?) so the red and orange and brown and purple look very similar.
I started trying to identify the resistors by writing down the colour codes on a bit of paper. Then I turned the page and found the parts list included colour codes, so I could cross check them. I got around half the colours wrong!! And that's before I try to decode them...
 
Is that not the definition of colour blindness? *some* colours are hard to differentiate if they have the same shade?

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