It is not unusual for me to start off a collage in one palette and to end in a completley diffrent zone. During one of my recent sessions in my art studio, I was working in soft cream colors, only to leave the studio with an incomplete piece that ended with shades of aquamarine and dark blues. One thing is for sure, never fall in love with your first layer. And if there are papers that you really are keen on, don't use them in the early phases of your piece, because if you work like most of us, these pieces will eventually become buried with newer layers. I also have learned through the years not to be too careful when covering my support with the first layer. Just let it go....the piece will eventually emerge that wants to be found.