After many days of fun and hard work, the first version of the ECOS database is available as of now. You can download it here.
"ECOS database is a collection of natural scenes optimized for standard visual tasks but that can easily be accommodated for other paradigms. A key aspect of this database is that it includes semantically matching and mismatching object-scene combinations which can be used to study many cognitive processes such as object-scene integration and segregation, object detection and identification and even visual search. You can download the full database HERE and check out fully functional scripts HERE."