A few years I spent frantically drawing ACEOs/ATCs cards – called Kakaos in German which is the word for cocoa but stands for the same as ACEO (just a nice Anecdote). I really love the aspect of trade and it’s lovely to get and send letters, package them and so on.
I mostly use Schmincke Horadam Watercolors, but also have some Winsor and Newton ones – I also sometimes use Ink of this company. Outlines and accents are often made with Faber Kastell Polychromos. My go to alcohol based markers are from Copic, though I’m not en par with newer brands since I have them for a long time and didn’t get new once for about 10 years.
My paper is usually Hahnemühle.