I've been dyeing yarn for 6 years now. I have a TON of colorways. I think I have dyeing ADD to go with my knitting ADD. I just have so many ideas I'm constantly dyeing new things. My gallery is stuffed full, you can see all my colorways there https://www.flickr.com/photos/shyviolet/sets/ and I'm constantly adding new stuff.
So one of my goals has been to add swatches of all my colorways knit up. I finally had an idea and started putting a bit of scrap yarn in with my yarn as I'm dyeing. Then when I'm done I have a perfect little sample of each colorway to knit up! Why didn't I think of this sooner?