The Mindquarry Desktop Client needs icons to inform a user of changes and conflicts to files and folders when attempting to synchronize. The following icons are an idea.

Changes / Conflicts / Obstructions

Add File / Add Folder - Green Plus sign. (afterthought was the tick)
The only problem here is that according to the tango icon theme the yellow glow indicates something newly added.
Remove File / Remove Folder - Red X sign
Conflict File / Conflict Folder -  exclamation mark sign (afterthough was the yellow background) 
Modified File / Modified Folder - Blue star