I got involved in a longies for yarn swap on Hyenacart recently, and here's how it works. I recieve yarn from someone who wants me to knit or crochet her some longies. In return, as payment, I get an equal amount of yarn to keep. These are the longies I made out of the Peace Fleece she dyed and sent me.
From the Freckle Bottoms pattern, these have a moss stitch cuff:
And these are crocheted from my Gillyweeds Bottoms Up Soaker pattern, with a little ruffle.
And here's what I get to keep!