diff --git a/dome.png b/araucaria_brasiliana.png
similarity index 100%
rename from dome.png
rename to araucaria_brasiliana.png
diff --git a/branch.png b/chamaecyparis_obtusa.png
similarity index 100%
rename from branch.png
rename to chamaecyparis_obtusa.png
diff --git a/cupressus_sempervirens.png b/cupressus_sempervirens.png
new file mode 100644
index 0000000..9eb1022
Binary files /dev/null and b/cupressus_sempervirens.png differ
diff --git a/index.html b/index.html
index 5cae33e..b811380 100644
--- a/index.html
+++ b/index.html
@@ -70,7 +70,7 @@
   <h1>Springy.js</h1>
   <p class="subtitle">A force directed graph layout algorithm for JavaScript.</p>
 
-  <div class="divider"><img src="branch.png" align="top" /></div>
+  <div class="divider"><img src="chamaecyparis_obtusa.png" alt="Chamaecyparis obtusa" title="Chamaecyparis obtusa" /></div>
 
   <p><a href="https://github.com/dhotson/springy/">GitHub</a> | <a href="demo.html">Demo</a> | <a href="mailto:dennis.hotson@gmail.com">Contact</a></p>
 
@@ -149,7 +149,7 @@
   renderer.start();
 })()
   </script>
-  <div class="divider"><img src="pine.png" /></div>
+  <div class="divider"><img src="sequoya_gigantea.png" alt="Sequoya gigantea" title="Sequoya gigantea" /></div>
 
   <div id="usage" class="section">
     <h2>Basic usage</h2>
@@ -159,7 +159,7 @@
     <p>Take a look at <a href="#">demo.html</a> and <a href="#">springyui.js</a> for an example of usage.</p>
   </div>
 
-  <div class="divider"><img src="nut.png" /></div>
+  <div class="divider"><img src="cupressus_sempervirens.png" alt="Cupressus sempervirens" title="Cupressus sempervirens" /></div>
 
   <div id="usage" class="section">
     <h2>Advanced usage</h2>
@@ -207,13 +207,13 @@ graph.newEdge(node1, node2);
 renderer.start();
 </pre>
 
-  <div class="divider"><img src="cone.png" /></div>
+  <div class="divider"><img src="pinus_serotina.png" alt="Pinus serotina" title="Pinus serotina" /></div>
 
   <div id="usage" class="section">
     <h2>Acknowledgements</h2>
   </div>
 
-  <div class="divider"><img src="dome.png" /></div>
+  <div class="divider"><img src="araucaria_brasiliana.png" alt="Araucaria brasiliana" title="Araucaria brasiliana" /></div>
 
   <script type="text/javascript">
     var _gaq = _gaq || [];
diff --git a/nut.png b/nut.png
deleted file mode 100644
index 89b389e..0000000
Binary files a/nut.png and /dev/null differ
diff --git a/cone.png b/pinus_serotina.png
similarity index 100%
rename from cone.png
rename to pinus_serotina.png
diff --git a/pine.png b/sequoya_gigantea.png
similarity index 100%
rename from pine.png
rename to sequoya_gigantea.png