Gifted amateur working with variety of different woods like pine,oak and something from Indonesia that I haven't typed yet. If one needs to use caps or plugs for recessed screw/nails you would just go to the store and buy the ones to match your project.
I don't have that wide variety of stores to draw from and of the ones that are accessible they are usually beveled and not flat. I don't typically stain my projects so it is important to me to match the colour from the get go.
To try and work with what I have I was trying to take saw dust from my cuts, mix it up with carpenters/wood glue and jam it in the hole. Once it dried chisel of the chunks and sand down. It makes for a nice effect but moisture gets in there and usually ruins it.
Anyone have any kludges or other approaches to making plugs or hiding screws in general?