diff --git a/themes/doubletime/doubletime.theme.bash b/themes/doubletime/doubletime.theme.bash
index 17def32..c3bf453 100644
--- a/themes/doubletime/doubletime.theme.bash
+++ b/themes/doubletime/doubletime.theme.bash
@@ -6,9 +6,19 @@
 SCM_HG_CHAR="${bold_red}☿${normal}"
 SCM_THEME_PROMPT_PREFIX=""
 SCM_THEME_PROMPT_SUFFIX=""
-RVM_THEME_PROMPT_PREFIX="(rb: "
+if [ ! -z $RVM_THEME_PROMPT_COLOR ]; then
+    RVM_THEME_PROMPT_COLOR=$(eval echo $`echo ${RVM_THEME_PROMPT_COLOR}`);
+else
+    RVM_THEME_PROMPT_COLOR="${red}"
+fi
+RVM_THEME_PROMPT_PREFIX="(${RVM_THEME_PROMPT_COLOR}rb${normal}: "
 RVM_THEME_PROMPT_SUFFIX=") "
-VIRTUALENV_THEME_PROMPT_PREFIX="(py: "
+if [ ! -z $VIRTUALENV_THEME_PROMPT_COLOR ]; then
+    VIRTUALENV_THEME_PROMPT_COLOR=$(eval echo $`echo ${VIRTUALENV_THEME_PROMPT_COLOR}`);
+else
+    VIRTUALENV_THEME_PROMPT_COLOR="${green}"
+fi
+VIRTUALENV_THEME_PROMPT_PREFIX="(${VIRTUALENV_THEME_PROMPT_COLOR}py${normal}: "
 VIRTUALENV_THEME_PROMPT_SUFFIX=") "
 
 if [ ! -z $THEME_PROMPT_HOST_COLOR ]; then