While ideas-searching on google for skirt designs, I came across this comprehensive summary of various skirt shapes. It has almost every basic designs you can think of! Now I have a set of skirt-opedia to refer to when designing. It also has a series of other bodice and sweater shapes available. Go check it out and be inspired!
*The 2nd skirt from the right should be a 6-panel skirt instead of 8-panel.
(Credits to http://www.infovisual.info/06/009_en.html)