I've just added some new functionality to the site: the Sigil Generator. This is the same functional component that I used to generate the sigils used for the album artwork for the Pegataur album Eternal Flight. To check it out, just select "Sigil Generator" from the navigation under Esoteric Tools.
The Sigil Generator requires that you input a Hebrew word or phrase. You can use the Gematria Database page to lookup Hebrew words or transliterate English into Hebrew to use for the Sigil Generator. I didn't bother with any obvious "export image" functionality, although I might do that later. For now, if you want your sigil, just right-click (PC) or control-click (MAC, I think?) on the sigil and save from your browser. If you don't want the colored background/lines, just uncheck the "Use Planetary Color Scales" box.