I don't know much about "Fido" and "Amelia"...it seems too much like an inside joke. Which one is which book again?
I think it was an unfortunate choice to go with blue for two editions in a row. I know why O'Reilly did so, but that doesn't make it any less confusing now.
Can we start to petition for Camel 4 to be in a different color? Perl6 will be here in a couple of years, and a new Camel should be right on its heels. A different color would be nice -- or perhaps a two-hump camel instead of a one-hump. Then we'd have a pink (fuchsia) camel, two blue camels, and a two-hump camel.