After seeing a few shots (some by Denim) developed with Caffenol, a Folger's instant coffee based developer, I decided to give it a go.
It actually works pretty damn good. A couple of my negs were a bit splotchy and I guesstimated on development time since I forgot to develop at 20˚ C. I think developing a better agitation method will help a bit.
These shots were scanned in BW and toned digitally. (The negs have actually a slight brown tint and if you were to scan as color and invert they'd most likely end up blueish and not like this.)