My favorite gallery replacement app QuickPic, which is notorious for its speed and simplicity, just got updated with a brand new spiffy UI based on the new Android design guidelines that were published at the time of the Ice Cream Sandwich release.
The new UI in v2.0 is now much cleaner and more fluid, with action buttons at the top right and context buttons showing up dynamically on the bottom when they're needed. QuickPic did have to rebuild all the thumbnails, but once it's done so, it loads faster than it ever has.
Check out the new 2.0 beta in the Market, and if you've never tried QuickPic before, I strongly encourage you give it a go. After all, it's free and uber fast, and has a slideshow mode - what more can you ask?