Can abstract concepts be turned into Countryball comic ideas?

Yes, abstract concepts can lead to very creative comics. You could create a comic where 'Democracy' is a character trying to teach 'Autocracy' about freedom of speech, or a comic about 'Globalization' being a force that connects and sometimes overwhelms smaller countries. Even concepts like 'Art' or 'Music' could be personified by different countryballs sharing their creative expressions.