Cumulus Cloud: http://upload.wikimedia.org/wikipedia/commons/8/89/Cumulus_cloud.jpg
Stratus Cloud: http://urbanext.illinois.edu/kalani/images/18_stratus2.jpg
Nimbostratus Cloud: http://www.uwsp.edu/geo/faculty/ritter/images/atmosphere/clouds/nimbostratus_NOAA_wea02042.jpg
Stratocumulus Cloud: https://pantherfile.uwm.edu/vlarson/www/AC_sunset_d_mcclary.jpg
Altocumulus Cloud:
http://www.uwsp.edu/geo/faculty/ritter/images/atmosphere/clouds/wea00039_altocumulus_noaa_Ralph_Kresge.jpg
http://cl0uds.files.wordpress.com/2009/02/altocumulus.jpg