If you're reading this story on a Widows PC (Vista or later), do me a favor. Minimize your browser and any other windows so that just the desktop is showing. Hold down the control button. Then scroll your mouse wheel up about a dozen times. Congratulations, you've just replicated the effect of Giganticon without even installing the app.
Giganticon has one purpose, and one purpose only: it makes the app icons on your homescreen enormous. Technically it's a widget - place a Giganticon widget on your homescreen in the standard way, and it will open up a menu letting you select any app. Tap that sucker, and a mega-sized version appears in the defined space.
Giganticon will pull down relatively high-resolution app icons from the Play Store (which of course won't work if you've side-loaded or installed via Amazon). Different icons can be substituted for a more customized look. The effect looks surprisingly good, even on a Nexus 10 - Giganticon widgets download app icons at up to 512x512 resolution. The only widget size is 2x2, so those with Gingerbread or Froyo may need a 3rd-party launcher to get the desired effect.
While customization junkies are always happy for another bit of visual flair in their toolbox, there are more practical applications for this, uh, application. A homescreen filled with Giganticons could be useful for a kids-only tablet, or people with poor eyesight, or maybe that Nexus 7 you got for your great-grandmother who only uses four apps anyway. For Android 4.2 users, the app also includes lockscreen widgets. Giganticon is a free download.