Red&Blue, a.k.a. "Office Art"

A few years ago I invented the so called "office art" in a way that I can draw or paint anything but with those materials I have in my workplace.
Soon I realized I had only blue and red gelpens and after a while I started doing red and blue sketches and drawings at home because I got to like working with these two colors so much.
Ok, you will notice that sometimes the blues and the reds does not have the same shade.. That is because I use sometimes 'normal' blue and red pens, not only gel pens.

Here are some gelpen-made pictures: