This visualization plugin is like the default Metric plugin, improved to be colorful !
You can install this plugin in Kibana 4 by doing the following in your home directory ($KIBANA_HOME is generally /opt/kibana) :
git clone https://github.com/oxalide/kibana_metric_vis_colors.git
zip -r kibana_metric_vis_colors kibana_metric_vis_colors
$KIBANA_HOME/bin/kibana plugin --install metric-vis-colors -u file:///$HOME_DIRECTORY/kibana_metric_vis_colors.zip
Go to "Visualize" in Kibana and create a new visualization
Then you can choose the colors you want in the options. You can use any color listed here, or any hexadecimal color code like #000000.