have you tried looking thru the seed selection of horizonherbs.com? you may find some very useful ones there.

How about pokeweed?

en.wikipedia.org/wiki/Poke_berry

Pokeweed berries yield a red ink or dye, which was once used by Native Americans to decorate their horses. The United States Declaration of Independence was written in fermented pokeberry juice (hence the common name 'inkberry'). Many letters written home during the American Civil War were written in pokeberry ink; the writing in these surviving letters appears brown. The red juice has also been used to symbolize blood, as in the anti-slavery protest of Benjamin Lay. A beautiful rich brown dye can be made by soaking fabrics in fermenting berries in a hollowed-out pumpkin.

It grows like mad around my place here to the point of being invasive. I don't have any seeds right now as they aren't something I'd have saved. BUT I do know where they were growing around here and I might be able to harvest some rootstock. It's perennial so that might work out.

Pretty sure Pokeweed will not grow here...(ovewrwinter..it's a perennial) try...
-Berries (Rubus sp.) blacks and reds.
-Elder (Sambucus nigra) for blacks and purples
-Privet berries (Ligustrum sp,) blue/green
-Goldenrod (Solidago canadensis) yellow
Coffee grounds for browns...

Happy dying,
~SeedPlanter

BTW, did ya get the dill?