I tried in earnest to find some Goldenrod galls today for floats. It's harder when the leaves are still on all the plants. I found a few that were still green and a few that had started to turn. I walked the edges of fields and woods to find them. I will return after a few frosts and search more thoroughly. I'm going to dry these and see if it effects the color.
I put the galls in dehydrator for a couple of days. The forced drying gave them a slightly lighter color. Next I'll trim them down to the final length and smooth out some of the rough spots.