Old Tibetan calligraphy by Tshe-tan Zhabs-drung ཚེ་ཏན་ཞབས་དྲུང followed by the Tibetan Phags-pa fonts by Babelstone and the square Mongolian style of Phags-pa used for decoration.

Seems to originate from the 1200s and is sometimes called square script. Also see the arabic square kufi.

Thanks to µB for the heads up! More here.

Kufi works by Abdulaziz Şahin, Turkey. All these designs contain the word Muhammed or Allah, or both. More here.

Square kufi scripts by lutfi. All these images are text. 

Calligraphy in zoomorphic shapes, via.

Mirror writing in the Ottoman calligraphy. Formed by writing in the direction that is the reverse of the natural way for a given language, such that the result is the mirror image of normal writing.