diff --git a/theme.aagi/R/theme_aagi.R b/theme.aagi/R/theme_aagi.R
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+
+#' A ggplot2 Theme Using a Unified AAGI Style and Typography for Plots
+#'
+#' This theme follows a standard \acronym{AAGI} style including typography
+#'   guidelines that uses (hopefully) sensible defaults for \CRANpkg{ggplot2}
+#'   graphics.
+#'
+#' @param base_size `Numeric`.  The figure's base size, set to 12 by default.
+#'   For presentations using a larger `base_size` will make the fonts larger and
+#'   more suitable for presentation slides, _e.g._, `base_size = 24`.
+#' @param major_grid `Boolean`.  Include major gridlines in the panel.  Defaults
+#'    to `FALSE` with major gridlines, including those between facets not
+#'    included.
+#' @param minor_grid `Boolean`.  Include minor gridlines in the panel.  Defaults
+#'    to `FALSE` with minor gridlines not included.
+#' @param border `Boolean`. Include a border around the figure on all four
+#'   sides, *i.e.*, x-axis, y-axis, top and right sides all will have a black
+#'   border not just x-axis and y-axis.  Defaults to `FALSE` with only the
+#'   x-axis and y-axis being outlined in dark grey.
+#' @param ... Other arguments as passed along to [ggplot2::theme()].
+#'
+#' @examples
+#'
+#' library("ggplot2")
+#'
+#' # Plotting discrete values
+#' p1 <- ggplot(mtcars) +
+#'   geom_point(aes(
+#'     x = wt,
+#'     y = mpg,
+#'     colour = factor(gear)
+#'    )) +
+#'   facet_wrap(~ am)
+#'
+#' p1 + theme_aagi()
+#'
+#' # Plotting continuous values
+#' df <- reshape2::melt(outer(1:4, 1:4), varnames = c("X1", "X2"))
+#'
+#' p2 <- ggplot(df, aes(X1, X2)) + geom_tile(aes(fill = value)) +
+#'   geom_point(aes(size = value))
+#' p2 + theme_aagi()
+#'
+#' # Using a larger base size for presentation slides
+#' p1 + theme_aagi(base_size = 24)
+#'
+#' # Plotting using minor gridlines
+#' p1 + theme_aagi(minor_gridlines = TRUE)
+#'
+#' # Plotting using major gridlines
+#' p1 + theme_aagi(major_gridlines = TRUE)
+#'
+#' p1 + theme_aagi(border = TRUE)
+#'
+#' # Plotting with both gridlines and border
+#' p1 + theme_aagi(minor_gridlines = TRUE,
+#'                        major_gridlines = TRUE,
+#'                        border = TRUE)
+#'
+#' @seealso theme_aagi_map
+#' @rdname theme_aagi
+#' @importFrom ggplot2 `%+replace%`
+#' @author Adam Sparks, \email{adam.sparks@@curtin.edu.au}
+#' @export
+
+theme_aagi <-
+  function(base_size = 9,
+          major_grid = FALSE,
+          minor_grid = FALSE,
+          border = FALSE,
+          ...) {
+
+    # check if Proxima Nova is installed, if not, falls back to Arial
+    aagi_font <- set_aagi_font()
+    aagi_black <- AAGIPalettes::colour_as_hex("AAGI Black")
+    aagi_grey <- AAGIPalettes::colour_as_hex("AAGI Grey")
+    aagi_teal <- AAGIPalettes::colour_as_hex("AAGI Teal")
+
+    showtext::showtext_auto()
+
+    base_line_size <- base_size / 12
+    base_rect_size <- base_size / 12
+    major_grid_size <- base_size / 48
+    minor_grid_size <- base_size / 96
+
+    theme_aagi <-
+      ggplot2::theme_classic(base_size = base_size,
+                             base_family = aagi_font) %+replace%
+        ggplot2::theme(
+          # match legend key to panel.background
+          legend.key = ggplot2::element_blank(),
+          legend.background = ggplot2::element_rect(color = aagi_black,
+                                                    fill = "#ffffff"),
+          #AAGI colour facet strips
+          strip.background = ggplot2::element_rect(
+          fill = aagi_teal,
+          colour = aagi_teal,
+          linewidth = base_line_size
+          ),
+          strip.text = ggplot2::element_text(
+            colour = "#ffffff",
+            family = aagi_font,
+            face = "bold",
+            margin = ggplot2::margin(3, 3, 3, 3, "points")
+          ),
+          plot.margin = ggplot2::margin(25, 25, 10, 25),
+          text = ggplot2::element_text(family = aagi_font,
+                                       size = base_size),
+          axis.text = ggplot2::element_text(family = aagi_font,
+                                            size = base_size),
+          legend.text = ggplot2::element_text(family = aagi_font,
+                                              size = base_size),
+          plot.title = ggplot2::element_text(
+            family = aagi_font,
+            face = "bold",
+            size = base_size * 1.25,
+            hjust = 0,
+            margin = ggplot2::margin(0, 0, 10, 0)
+          ),
+          plot.title.position = "plot",
+          complete = TRUE
+        )
+
+    if (isTRUE(minor_grid)) {
+      theme_aagi <- theme_aagi +
+        ggplot2::theme(panel.grid.minor =
+                        ggplot2::element_line(color = aagi_grey,
+                                      linewidth = minor_grid_size))
+    }
+
+    if (isTRUE(major_grid)) {
+      theme_aagi <- theme_aagi +
+        ggplot2::theme(panel.grid.major =
+                        ggplot2::element_line(color = "#bdbdbd",
+                                      linewidth = major_grid_size))
+    }
+
+    if (isTRUE(border)) {
+      theme_aagi <- theme_aagi +
+        ggplot2::theme(panel.border =
+                        ggplot2::element_rect(
+                          fill = NA,
+                          color = aagi_black,
+                          size = base_rect_size
+                        ))
+    }
+
+    return(theme_aagi)
+
+  }