Some artists painted guitars on canvas.
See below Pablo Picasso arts examples:


La guitarra retratada por los grandes artistas: Pablo Picasso La guitarra retratada por los grandes artistas: Pablo Picasso

Above: 'The Musicians', about 1921 and 'Mandolin and Guitar', about 1924;
Below: 'Ma Jolie' (Woman with Guitar), 1911 and 'Old guitar Player' 1903.


La guitarra retratada por los grandes artistas: Pablo Picasso La guitarra retratada por los grandes artistas: Pablo Picasso

These images was surveyed: http://picasaweb.google.com/fotosaula/Cubismo#
(April 24th, 2011, about 08 and 09 p.m.)