Any artwork (c) Nicolas "Shangri"l Chartoire, and sometimes others. 

Unless otherwise mentionned each artwork is under Creative Commons by-nc-sa 2.0 fr license. 

Ed Et Tom - Gallerie d'art & Ed Et Tom - Sampling Attitude uses Quatrelle sans elles' work and are under Creative Commons by-sa 2.0 fr

Sans Issue uses elements from Le che était un beauf by Le morse des mers, courtesy of Le morse des mers

Some artworks uses elements created by Le Panda courtesy of Le Panda

For the above cases, please refer to http://zcgallery.over-blog.com/article-pixel-art-obscur---creations-de-nicolas-chartoire-shangri-l-55133366.html

Routard Marianne
License : GNU Free Documentation License 1.2 no Front Cover Text, no Back Cover Text and no Invariant section.  
http://www.gnu.org/licenses/old-licenses/fdl-1.2.en.html#SEC1
Photographer : Donar Reiskoffer http://commons.wikimedia.org/wiki/File:20111226_Brugge_(5).jpg
filename : routard_marianne.jpg

L'agent secret Pikachu pilote un Avia S-199 israëlien en opération de guerre psychologique, dans la bande dessinée fictive Steaminator 10€-2 - c'est un dérivé tchèque du Messerschmitt 109
Licence Creative Commons by-nc-sa 2.0 fr
Photographer unknown http://commons.wikimedia.org/wiki/File:AviaS199Israel.png
filename : Pikachu_Avia.png