Shape poetry can be built with images rather than words as in the poem Eye for Eye
by Augusto de Campos courtesy http://www2.uol.com.br/augustodecampos/poemas.htm.
While the term is new, the concept is old. Poets used letter arrangements to enhance the meaning of their poems back in the third and second century BC in Greek Alexandria, Egypt. Early shapes included wings, altars and axes.
Possibly the earliest German shape poem, Gerechtigkeitsspirale, is carved in wood in the St. Valentin Church in Hesse, Germany. George Hebert's Easter Wings, written in a shape to convey birds flying up with outstretched wings, was composed in the 1600's.
In the story Alice's Adventures in Wonderland, the concrete poem a mouse's "tale" appears, in the shape of a tail. E. E. Cummings, known for his lower case poems, also used the arrangement of letters to convey meaning in his writing. Ezra Pound was known for his Chinese idioms.
John Holland's poem Swan & Shadow circa 1969 courtesy http://beckyjaffephotography.com/category/upcoming-events/exhibits/
For more information about concrete poetry, read Pattern Poetry: Guide to an Unknown Literature (Dick Higgins).