Hike, an IM app from India, has received an update that brings a new, nice feature called Chat themes. You can set different themes for each chat you have from a set of 20, with different textures.
Apart from that, Hike also has a simple, Holo-adherent UI. It’s fast enough, and allows Indian users to send free SMSs to their Indian friends. There are some more features to distinguish it from other apps like WhatsApp, one of them being the ability to disable the “Last seen at” feature. There’s an option to use SSL encryption as well, and you can ‘Favourite’ people who already are on Hike and in your phonebook.