On consideration, I decided that the pink was really not the right colour for the challenge. So I dropped by the quilt shop - for the third time in 3 days - and picked up what I think is a slightly better match to the palette.
Here's my new fabric set (on the left).
Hopefully I won't change my mind before I start the quilt :)
This is the pattern I plan to use.
It comes from the Quilt Calendar I received for Christmas. Hopefully I have enough of the blue and green (fat quarters). If not, I'll resize the quilt down a bit so I don't run out.