Using Gimp for turning photos into Marquetry

[denzjos]

I tried this : 
Filters / Artistic / Olify (Number of intensities - 8 or more)
Use 'Autotrace' to create paths
Or : 
'Image / Mode / Indexed' (set maximum color palette 8 or more)
'Image / Mode / RGB'
Use 'Autotrace' to make paths

Autotrace : 
http://gimpchat.com/viewtopic.php?f=9&t=21642