Per Erik Strandberg's IconLib are a bunch of Icons inspired by Mark James Silk Icons.
They are, as you say, under construction. The goal is to have at least 1000 icons when this project is done. I doubt that I'll ever finish them without a helping hand from someone.
Per Erik Strandberg's IconLib can be downloaded in zipped png (64x64 pixles) format: iconlib.zip (about 300kB)
Per Erik Strandberg's IconLib are drawn in SVG (Scalable Vector Graphics) format using InkScape. There are also a set of icons in PNG format (640x640 pixles) available. If you would like the source code please contact me (per at pererikstrandberg dot se) to to negotiate terms.
A screenshot of one if the icons in InkScape:
IconLib icons that are available right now