DIY Window Trim - The Easy Way | Bless'er House - I want to trim all the windows in our entire house like this! For a more vintage look, go a little wider on the side casing and apron and make the 1x6 header slightly narrower.
For the baseboard we're considering a couple options. Either a plain rectangular board. A small bead detail around the top of the baseboards to give it a little interesting detail and help keep from having a big ledge for dust to gather on (not the most authentic trim but still fits with the style). Or a more complicated baseboard like this with a slight miter on the top and a rounded cap part way down: