The University of Cape Town's Sakai Vula gateway features a collection of graphic art produced to both promote Vula and engage students, faculty and staff in the process of online learning. There are ten images in the collection, one of which is loaded randomly whenever the gateway page is requested.
"V is for Vula" in red, black and yellow is particularly striking; David Horwitz tells me the design is inspired by an old United Democratic Front (UDF) anti-apartheid poster.
Another image I find quite creative spells out "Vula" (meaning "open" in Xhosa and Zulu) in sign language backed by a splash of magenta—if my color sense is correct.
The collection is a worthy follow on to Vula's original gateway image, the very cool "Vula unzipped" image—as some have called it—that I've used on the title page of many of my Sakai powerpoint presentations.
Visit Vula and checkout the gateway page. Refresh the page a few times and have a look at the designs.