Several icon sets and a update for AISS in the new AmigaOS 4.1 Update 1 style are available on the Masonicons website.
Masonicons Collection - Icons for apps, tools and utilities
Basic Icons Collection - A basic icon collection for developers
Disk Icons - A collection of disk icons
AISS 4.7 - 2000 new and reworked toolbar images (OS 4.1 Update 1 only - on older systems you have to install AISS 4.6 first)
Link:
www.masonicons.de