A lot of folks jailbreak their iDevices to add functionality to iOS. Maybe they do it to download SBSettings to access toggles quicker, or to install Xpander to save time typing. For the most part, though, people tend to jailbreak for productive reasons.
But Cydia also has a lot of non-productive apps. Not just games, but entertainment-type apps that are more likely to be used in a round of "look what my phone can do," rather than actually used. Now that I've preempted what category this one falls into, here's iWindows...