The stipple and X cursor are forever ingrained into my memories. I remember it so vividly how back in 1998 when I installed my first Linux distro (suse 6-ish) and after some configuring i typed "startx" and then BOOM! Grey "unix-y" weirdness for a minute or two and then KDE 1. It will never not hit me with immense levels of nostalgia whenever I come across it, which admittedly is not very often these days.