Douglas Hofstadter, in Metamagical Themas presents some Parquet Deformations generated by students of William Huff. Those patterns (as far as I can tell) were hand-drawn. Some of MC Escher's work explores similar ideas, but more lyrically - the original Parquet Deformations appear to have been created on drawing boards. Bulli is a toolkit, with examples, for generating Parquet Deformations. Bulli - 'Parquet Deformations' a la Escher | 
