I had originally planned to use a single fabric for each colour. But I didn't have quite enough of the turquoise I wanted to use, and the alternate just didn't play as nicely for me. So I switch to scrappy turquoise - which meant going scrappy for the pink and green, also. In the process, I morphed my colour palette a pretty long way from my original selection (which was based as best I could on the paint chip photos). I ended up with more of a grass green, a lighter pink, and a richer turquoise I think.
However, I love the way they all play together, and that is really the most important part - not necessarily to match Bonnie's choices but to like your end result. I tried to match her paint-chip colours really closely on Celtic Solstice, and was unfortunately very unhappy with my result (a very dark quilt). Probably the result of matching photos rather than real paint chips - but it's led me to trust my instincts more than the pictures.