Hey Fireche
I have plenty of experience with building and decorating levels using tilemaps (using tile-background, 9-patch, sprites and vector where needed).
For my game Bad Pad I built 160 levels/layouts, the levels/layouts size increases exponentially as you progress.
http://store.steampowered.com/app/517210/
For Bad Run Turbo Edition I built 3 big open-world castle levels (total size 83000 x 56000 px)and a procedural run-time level generating system using over 100 predesigned tilemap sections.
http://store.steampowered.com/app/1285070/
For my latest game I already made around 140 layouts.
http://store.steampowered.com/app/1367050/
http://headbangames.com/becloudead/devblog/
You can read more about my work and contact me here:
http://headbangames.com/devblog/contact/
Cheers
Perfect, I sent you an email :)