See no "child-like" elements in the design or that they are un-professional. On the contrary, I like them much better than the original icons which I find rather flat, pale and cold. These would make OmniWeb more "Leopard-like". And as one critique deserves another I would say that the www.nasendackel.de looks like a quick RapidWeaver job. Not much originality there with all the exact same windoze folders. The $20 flash plugin to show photos is quite passe. See, we all have different viewpoints!

So, 2 positive votes so far for the icon set. Score is 2-1, pro these icons.