Risograph printers are pretty darn cool! Even the church thinks so.
Mostly used by churches and school to produce colourful flyers cheaply and quickly, the risograph printer allows a lot of exploitation for arts purposes.
It's inks are soy based, wet and extremely vivid; working in conjunction to a screen-print-esque layer based printing method, it's easy to create something fun and crazy. That why I like it. Some of these were for paid briefs and others just spur of the moment ideas, as this method really lends well to both.