FLP/FRT and fluorescent markers can be used to generate mitotic clones in the eye with normal and mutant photoreceptor cells expressing different fluorescent markers. The method was described in:
Gambis, A., Dourlen, P., Steller, H., Mollereau, B. (2011). Two-color in vivo imaging of photoreceptor apoptosis and development in Drosophila. Dev. Biol. 351(1): 128--134.