Aqua-Soft ForumsMini Icon Set Part 3 which rendered at 48×48, 32×32, 24×24, 16×16 pixels and formats are png, ico and icns. This set provides 2 color styles (deep and light) to choose.
download here:
http://www.customicondesign.com/free-icons/mini-icon-set/mini-icon-set-part-3/