The tool comes in a zip file; you just need to download ... You can also add your own custom colors in Folder Painter and customize the Icon folder with your custom color icons.

lets you enlarge the preview and change the folder icon style. You still need to deal with a single file preview (in Windows 7, for example, folder thumbnails can show several images ...

Tap the ZIP file. A moment later, an unzipped folder with the same name will appear ... If it's an image, you can even open it and tap the share icon to save it to your device's camera roll.