The comic strip museum in Brussels has initiated the creation of murals of comic strips all over town. For more info on the museum visit http://www.awn.com/mag/issue4.03/4.03pages/moinsbrussels.php3
The site of the makers of these and other murals: http://www.art-mural.eu/html/bd_bruxelles.html
Photos and descriptions of comic strip murals can be found on:
- http://www.ebru.be/Other/Strips/StripsHome.html (French and Dutch)
- http://bdmurales.skynetblogs.be/post/4548589/51-frank-pe--bom-broussaille--les-baleines-pu (very complete)
- http://www.tout-sur-google-earth.com/dessins-f118/le-parcours-bd-de-bruxelles-franquin-t11217.htm
Route: http://www.brusselsinternational.be/wabxlint/en/visitor/discover/walks/1321/brussels-and-comic-strip-your-trail.act
Tintin murals in Stockel metro station: http://metro-de-bruxelles.blogspot.com/2006/05/stockel-stokkel.html
Map at http://www.brusselstripstad.be/

Warning: some of the murals are in an area that the Brussels police consider very dangerous for tourists. At least that's what they told me after my wallet was stolen in the Rue de Zenne/Rue de la Buanderie area.

Antwerp also has comic strip murals.

Angouleme in France also has a comic strip museum and comic strip murals. Check out my Angoulême page.