In my eyes the single most bizarre motherboard from the list is the AOpen AX3SP Pro Che Che (2001), which (not surprisingly) was released solely in Asia.
And while taste is a personal thing that can vary, a lot of people would likely be baffled by the eccentric-looking AOpen AX3SP Pro Che Che, from 2001. Pink expansion slots and CPU cooler, purple highlights, strange-looking smiley faces printed all over the board, with one huge smiley on the purple back and CheChe! written in the corner...