The Shaykh Al-Albani’s advice regarding covering the mosque floor with decorated carpets and mats.

The Shaykh : It helps in perfecting the prayer and doing it well, and not... What is true is that one prays and then goes home to escape the cold; there is no harm in that. As for carpet or decorated rugs, there is no harm in carpet or decorated rugs. It is not permissible in the mosque. This mat, this mat is not permissible in the mosque, so one should give it in charity. As for a plain mat or a plain carpet that does not distract the worshippers, there is no harm in it.