Answer:
In fact, it is an innovation - which is not good - mentioned by the Prophet Muhammad (peace be upon him) as one of the many signs of the last days.
People got it into their heads to decorate the masjid (mosque) with calligraphy. But it would have been better to remian doing what the Prophet did, which was to leave the walls pure so that they do not distract from worship.
Why we do not have paintings of people? because that is what idol worshippers do. It is forbidden by God. Christians do it because they are a faith mixed with Roman paganism. But Jews and Muslims do not. Ever.
so other religions people don't understand what is written
even though its written bad about other religion
in side a mosque they use calligraphy, a decorated pattern with swirls and lines. they do not show images of god for it is unholy
Arabic calligraphy .
Muslim Art
Islamic mosques
they are decorated with tiles that are belived to be respectful to god or Allah.
To construct and decorate the mosque, Walid employed the best craftsmen from Constantinople (now Istanbul) and from the Umayyad Empire.
no a mosque does not have arabic writting on the wall
There are no portraits of anyone or paintings of animals, as this may cause the Muslim to worship the painting instead of God. There are no statues or 'idols' for the same reason. To decorate the mosque there is patterns and often photo's/paintings of the great mosque's such as the Kabbah in Mecca. Also Muslims decorate the mosque with Scripture from the Qu'ran. In richer countries there is often a decorative carpet. Mosque's are, overall, quite plain though.Quranic text or other information in a beautiful presentation wall hanging is common as decor.One such Quranic decoration and information product for mosques is the canvas wall hanging available at amazon dot com and elsewhere called The Periodic Table of the Quranic Chapters . It is a unique decorative and informative product displaying amazing facts about the Quran created by a team of expert graphic art designers and lifelong Qur'anic researcher Ehsan Butt PhD.Key amazing discoveries of the last 150 years of the worldwide research on the thematic organization of the Qur'an along with interesting facts of its history are beutifully inscribed.
you can buy it online game stop , eb games have you seen the Chinese Calligraphy or Chinese Paper cuts? It's very sititable to decorate the wall I use to buy them from the internet, you can have a look http://www.undirect.com
facing mecca
mihrab
four trillion golf balls wall to wall, floor to ceiling.