HI Caleb! I get asked about paints quiet often, but it is not an area I work in so I don't have too much experience- other then yes, as Judith says- olive oil is great- my husband is a painter and has used olive oil for years now instead of turps or anything else for cleaning brushes. Most oil painters I know with issues around health or environmental concerns have changed mediums as a strategy, so finding earth pigments is a great options for those not wanting to change their practice too much!
And, there is something about reconnecting to the process- traditionally of course painters had apprentices- and this is what apprentices did, was spend ages just learning how to grind and mix colours before ever holding a brush- we have lost that now! The impressionist painting movement happened specifically because suddenly synthetic colours ( and natural pigments) available in tubes made quick, plein air painting even possible...
But what can you do if you want to go back to finding your own colour from the landscape? Judith's idea of madder is great, I have a friend who is a painter, Roser Oduber in Catlunya.
http://roseroduber.blogspot.ca/p/d-ments.html She lives at an old lime quarry northwest of Barcelona, and she manages to use a white calc ( chalk) she finds on the
land around her, and grinds and mixes it herself, I think she also finds her own earth tone pigments nearby, but then purchases her other brighter raw pigments for use.
Something to remember- - be open minded-if you switch materials, expect if you switch your process- the final product may change too in a big way- take it as an opportunity to rethink what you are making, as well as how you are making- I love how Peter L. Johnson
http://peterljohnson.com/art-process has embraced this in the work he does with
water and the river, the mud and the plants. So the intention of the work speaks to the content and materials he uses, or more specifically, the materials and environment he collaborates with.
For paper based work, I have played around with using
roots of yellow flag iris, cutting them up and soaking them for a few days with an iron railroad bolt, then cooking them, and straining to make a dark grey dye- I have added a small amount of corn starch and had decent results for viscosity with a brush then on paper for use as an ink- great colour, and think it is pretty light fast- but not sure as far as archival goes if the iron would break down the paper- I know iron is hard on fibres, and can break those down, so you need to be careful about how iron is used with barks and fibres- paper would be the same... Generally I have an attitude that not much of what I make really needs to live forever, how much of what we make is such great
art that it needs to out survive us!? That of course is a philosophical question and doesn't help the commercial artists who need to be able to tell their collectors that the work will not disappear before their eyes I realize.
If you do play with flag iris roots, know that they are poisonous- so don't use your cooking pots or
spoons, and wear gloves- keep your soaking pot away from children and pets too. good luck in your pigment adventure!