Well, since I really really Loved sooooo much the Light Coffee Theme by szerencsefia that you can find here:
I created this instructions and Color Schemes for KDE to reproduce it on KDE too. The main goal of this is not to actually use this styles on KDE alone (Even if you can do it, of course) but to integrate KDE applications in Gnome when you are using the Light Coffee Theme.
This wonderful Theme comes in 2 variants: the GTK version and the Murrine version. I love them both even if I prefer the Murrine version, of course. Since I think that people has to be free to decide which engine they want to use, in these instructions I'll show you how to configure KDE so that it looks like GTK or Murrine.
The Color Scheme has to be applied in any case using Kcontrol, so, if you don't have it, download it and install it (Ubuntu users can find every package I'll list here in Synaptic).
1) GTK Version (First Screenshot).
Just download the package Klearlook, open Kcontrol, load the Color Scheme, set Klearlook as your Style and then set a proper Icon Set similar to Human or native Gnome icons, as you prefer. I like Human more.
2) Murrine Version (Second Screenshot).
Download and install QTCurve (You can find it in this site or in Synaptic if you use Ubuntu Feisty). Run Kcontrol and load the color scheme, then move to style, select QTCurve and Configure it.
Under Option, choose to Import a qtcurve file and choose the one contained in this package. Choose an appropriate Icon set and you're done :)
Hope you enjoy this release. I love to have KDE and Gnome apps looking almost the same with Light Coffee and Light Koffe :)