Hm.. I noticed that you used several (seemingly inconsistend) styles
for the icons:
Flat, Flat with drop-Shadow, 3D standing on the ground (sometimes with
shadow) and 3d with a blocky look ("Speaker" or "Plugin").
It's because some old icons were made earlier and I didn't change
my style yet. Newer icons like Speaker and Plugin has my new style
which has outlines and 'blocky' oblique look.
Also the "Addressbook" icons seem to stick out as they are angled to
the screen.
Yes, I want to remake them.
Is there any intention behind this that I don't get?
No, they are bad icons :) Thanks a lot for mention it.