Celebrating Khatm Al-Quran (completing the Quran) is not part of the Sunnah. Yet, if done culturally—as a joyful occasion without believing it's a religious act—it is permissible. However, any religious practice, such as connecting the end of the Quran to the beginning, must be based on authentic evidence. Making Du`a’ at the time of completion is supported by reports from the Companions, like Anas ibn Malik.

The order of Surahs is not binding when writing, praying, studying, teaching or learning. There is no report from the Prophet (peace and blessings be upon him) concerning that which would make it forbidden to differ from it. Al-Bukhari reported that Al-Ahnaf recited al-Kahf in the first rak`ah and Yusuf or Yunus in the second, and he said that he had prayed Fajr with `Umar and he had done the same.

If hanging Quranic verses on walls is for purposes of decoration and adornment, this is an inappropriate use of the Quran as it was revealed to guide people and to be read regularly. The Quran was not revealed to decorate walls, but to guide mankind.