Interesting problem. What is the general class of "find this object in other pictures" called? I've noticed that most image search aims at a different goal: "find pictures like this picture" so tineye, Google Image Search, and friends are unlikely to be of use.

By the way, it reminds me of the flag of the Dravida Munnetra Kazhagam (a party from my home state in India), which coincidentally also uses a Sun amongst their symbols. I wonder if they've got a version with the Sun on their flag.

If I were an organization with clout in the field I would propose an alternative flag, but I imagine people are attached to this one. Well, good luck!