Is there a way to selectively sync photos?
Launch G+ Photos app. Swipe right on the left edge to open up the menu. Go to "On Device". You can select which folders to be synced by tapping on the cloud icon on the right of the folder name.

Note: You have to turn on "Back up local folders" option in settings. Initially, all folders will be synced and you can  selectively turn off for each folder in the "On Device" section.