A lot of konsole terminals have transperency option (if that's what you mean). Try Eterm or aterm.
The window manager seems to be GNOME, so you can use it to 'make' 'better' screenshots, if that is the style you like
About making Xchat transparent.. I'm not sure, haven't use 2.02 version. Maybe it's some kind of option from the menus. I prefer BitchX. You can run it in aterm and have transperency, too.
Tha last shot's wm seems to be fluxbox, nice for taking shots, too
The konsole terminal is Eterm with some sort of applied color theme.
I prefer aterm, though.
Here's something that I like more than these shots: