The fantasy genre could be used for the desktop, it would be very vibrant and appealing to all ages, everybody loves fantasy because anything is possible, and the finished desktp project could be anything as fantasy is pure imagination.
sci-fi could be could for the desktop project becasue sci-fi tends not to be very graphic thus it would appeal to all ages, because it is science fiction it is as fantasy in that all of the images you see are all imagination their for the possibilities are endless.
The horror genre could be too graphic for a desktop design as it is not suitable for all ages and could offend certain people because it tends to have alot of gore and graphic content which isnt appropriate for young children
War would not be a very good choice for a desktop project because of the content it has, it wouldnt be appropriate for children and people could take offence to it for unknown reasons.
japanese cherry blossom