I had a few mockups that i actually never finished... so i decided to finish and share them Maybe you'll find them interesting.
Krita:
http://artmil.deviantart.com/art/KDE-Krita-437502173
I'm planing to also make some mockups of krita tool windows.

Dolphin:
v1 http://artmil.deviantart.com/art/KDE-Do ... -437501775
v2 http://artmil.deviantart.com/art/KDE-Do ... -437499670
Mini http://artmil.deviantart.com/art/KDE-Mi ... -437500993

//Edit
Krita:
Filter Window http://artmil.deviantart.com/art/KDE-Kr ... -438220365
Menu http://artmil.deviantart.com/art/KDE-Kr ... -438220902

Looks cool. I like your use of space in the Dolphin toolbar. However, how would it look with two split views? Currently you get two breadcrumb/URL bars in that case, one for each split.

Since the view must be activated before you can navigate it so the breadcrumb could be updated when changing sides.
Or the main address bar could be hidden and two separate address bars could appear in the views.
Quick example: https://dl.dropboxusercontent.com/u/63396655/tmp/tmp.png

I like your design previews for dolphin. Especially the mini version of dolphin is very structured breadcrumb on top and icons down. I would previer that arrangement also for the desktop version of dolphin.

Glad you like it
Updated first post with some new images, krita filter window and main menu.