The Gallery is also offered for third party usage for previewing images / videos, adding attachments at email clients etc. It's perfect for everyday usage.
Contains no ads or unnecessary permissions. It is fully opensource, provides customizable colors.
This app is just one piece of a bigger series of apps. You can find the rest of them at http://www.simplemobiletools.com
Author: Simple Mobile Tools
Market link: com.simplemobiletools.gallery
Web site: http://simplemobiletools.com
Market downloads: >250,000
Market rating: 4.4 / 5.0