Just to explain how the final piece came into being: I prepped the wall, then cut shapes from orange and white sticky vinyl (random colors!) to use as a mask for the yellow paint. (Behr "Disney" yellow!)
When I finished painting yellow, I pulled off the orange vinyl to reveal really nice, clean edged shapes.
After the yellow, I projected the glyph shapes onto the wall and painted them using acrylic. Then I silkscreened, and finally I cut out skinny lines of black sticky vinyl to finish off the piece.