just to update this strange occurance :
1.Uninstalled both the blaze ipad and blueipad V2 themes from winterboard using cydia
(so no more theme that has chatkit framework on winterboard).
2.Changed the SBSetting theme from "blue" to default
(i did this just to get eveything with "blue" out of the way)
3. Respring twice from winterboard and iwipe cache.
4. Reboot my ipad
5. Ask my friend to send me i message
6 And ...... The bubble box for the incoming text STILL BLUE ,!!!!!
i am out of option (with my knowledge limitation), so for now with no more option and suggestion, i just live with it and hope for the 5.1 jailbreak to come soon so i can restore and re jailbreak ..