What are non-currency things you've traded art for, if you have
I'm in a few hobby gamemaker communities and I've traded art assets for code before. The occasional art for favors, like getting someone to test a site. Of course there's art-for-art, and sometimes I make posts (elsewhere obviously) where I give away completely free art just for a portfolio reason or just to have something to do. But I am more interested in hearing from artists who have treated it like favors for favors.
I know that in monetary spaces like this it is heavily frowned upon for clients to make those kinds of offers, but artists like me will sometimes do them for a trade. I've always been interested in the concept that at some cons and fairs people trade their physical merchandise at tables. Not all of them, obviously and I have never been, but I always liked the idea of it.
Have you ever traded art or goods for something non-currency related - and non-art too since that's so ingrained in the culture already.