Iphone app Text message Color changer

An app that installs on Iphone that allows the user to change colors of the text message. Both Color of Font and Color of background of their text message. There are already apps like this but this one I want an Icon that gets installed in the default text messenging app of the iphone so that it is an easy selection process. It should allow for default setting features so that they do not have to go back and select again. It should also allow them to choose Fun icons and faces that we can update from a remote server to give them more options. I can provide cpanel access to a remote server for storage and tracking of users. Needs to be native app that will need assistance loading into app store