Finally i made what i like - it simple and it black, with mutable background and messages grouping by sender
Check it out, it's looks realy nice

Hint: All you need is download attach zip and place all files from it (exept *NOT_OPTIMIZE.css) to /usr/share/rtcom-messaging-ui/html

MessagingWidgetsChatConversation_NOT_OPTIMIZE.css is for those peoples why want to edit it




how worse my english is? sorry