This is a gallery of inkblots I have created over the years. The LogoBlot image was created with paper and ink and then scanned into an image file. The other blots were created using GIMP with its various brushes, scripts, and layers.  In particular, Jeff Portaro's "inkblot" brushes for Photoshop/Gimp have been particularly helpful.  You can see his work here:  http://graphicriver.net/user/jeffportaro