Store the theme definition in the theme.info file as a comment.

modules/themeroller/helpers/themeroller_task.php

@@ -220,6 +220,7 @@ class themeroller_task_Core {
         $v->description = $task->get("description");
         $v->user_name = identity::active_user()->name;
         $v->is_admin = $is_admin;
+        $v->definition = json_encode($parameters["colors"]);
         ob_start();
         print $v->render();
         file_put_contents($file, ob_get_contents());

modules/themeroller/views/theme.info.php

@@ -5,4 +5,5 @@ version = 1
 author = "<?= $user_name ?>"
 site = "<?= !$is_admin ? 1 : 0?>"
 admin = "<?= $is_admin ? 1 : 0?>"
+; definition = <?= $definition ?>