This is stock android smileys plugin for Handcent SMS ,if you are using some android phone (for example: Droid X ,Droid2,SE X10) that didn't include stock green android smileys icons but you want to use stock green android smileys ,you can download it and apply from handcent settings->application settings->smileys settings.

*** Note: the app needn't launch ,it just a plugin,download it and enable it from Handcent SMS