From Top to Bottom:
No.6 and 10 looks nice but i don't like these clouds in No. 10.
There could be better something like you did in No. 6,
and signatures without color are ugly, fill them with color.
No. 4 could look this way much better than now.
Oh, and in No. 6 is a rectangle that doesn't fits in. Leave it! :D
"Let colors inside these lifes" - In Flames.
Greetz verT!c4L