Here are some resources made by me. Take it or leave it.
For March 1999 GIMP contest I have made the following image with my Wax Seal script. The contest (and whole contest page) is dead since then, *sigh*, but I liked the image so much I had to share it with you :-).
For each hose I have included GIH image hose file and its XCF source file for reference here. Both are compressed with GZIP. Unpack the GIH files to ~/gimp/brushes/ directory and reload brushes to use them. You can safely ignore the XCF files.
I have also made a simple script to save multilayered images as image hoses (actually only their components - the images and the masks). The script is crude and far from ready and obsolete today, but if you want it, it's here.Grab the source code for Gimp 1.1