One of the things I make with objects found at the river are charmed stones.
Here is an example. This one I gathered during a spring-time thunder storm, and I’ve left it out under nine downpours. I drew the vegvisir* stave on it during at midnight on the crossroads by the light of a lantern. I’m going to sew it into the scarf that I made for my sister, who is going through a rough patch in her life at the moment.
*vegvisir is one of the Icelandic magical staves used to guide people through rough weather