Cool even if blue.
You know, despite the title to this thread, I reckon they're meant to be black rather than blue, since schwarz is German for black.
For instance, the top left one at http://www.hobelbaenke.com/systainer.htm
is described as...
Systainer Schwarz mit dreiteiligem Einsatz fur Werkzeugsatz 34-teilig
...which I think says...
Black Systainer with three-part insert for 34-piece toolkit.
The red one is described as "Systainer Rot", where rot is German for red.