It has a button you click to scan your hard drive for icons or to choose the icons that you prefer. When you choose New Mosaic, Micaic puts those icons together to create a mosaic of an image you've selected.
Until you register, Micaic pops up a registration message every time you open the program and places a black and white X on all your mosaics. At any rate, you get a good idea of how it works and appears, plus you can save your creations.
Please read the documentation or visit the home page for more detailed information.
System requirements: Micaic should work on any PowerPC or 68K Macintosh running system 7.5.5 or greater.