diff --git a/references/trees/apple/apple_tree.png b/references/trees/apple/apple_tree.png new file mode 100644 index 000000000..0a250a4a8 Binary files /dev/null and b/references/trees/apple/apple_tree.png differ diff --git a/references/trees/cactus/cactus.png b/references/trees/cactus/cactus.png new file mode 100644 index 000000000..20dc8bcb4 Binary files /dev/null and b/references/trees/cactus/cactus.png differ diff --git a/references/trees/cherry/cherry_tree.png b/references/trees/cherry/cherry_tree.png new file mode 100644 index 000000000..ab12267db Binary files /dev/null and b/references/trees/cherry/cherry_tree.png differ diff --git a/references/trees/lemon/lemon_tree.png b/references/trees/lemon/lemon_tree.png new file mode 100644 index 000000000..02fb32334 Binary files /dev/null and b/references/trees/lemon/lemon_tree.png differ