ecupirate, what are you talking about exactly? The theme simplyclean is a different look that is comprised of different css class values and different images in most cases. What exactly are you looking for here? Also, a theme is not an enhancement, it is just a different look.

Sorry if I come off as rude, its not my intent as I am just busy and trying to answer things as quickly as possible.

DotNetNuke itself can be entry level .NET but when it comes to programming, I wouldn't start with this module as its fairly complex and to be honest is a fair size asp.net application all by itself (think about how many forum systems exist with no cms system or other modules that are a part of it) Now, I think this is one of the better documented modules for users but sometimes its hard to connect with various audiences. In terms of applying a theme, it if is there and you disable user skinning you can select a new theme and it will apply. The only exception to this could be a caching one, which requires the cache to be reset.