The God has designed a cross for every shoulder. I do not know how Christianity interprets it, but I think cross can be interpreted as responsibilities and hardships that one faces in day to day life.
Every step in our life brings new challenges, but we should move on, and God will be with us in our endeavor.
You generally wont find any explanations for my pictures, however vague they are. But this one specially requires one, for I can not risk not to. The flower is looking equally charming even without colors; it's the spirit of the flower! It's just one of the examples, where the external colors don't matter; what matters are the inner colors!