New Look

Good morning.  I am trying to go for a new look here.  What I really wanted was a St Patrick's Day theme.  I am searching for an easy way to update the look on my blog with the seasons, holidays, themes, etc.  This is a learning curve for me.  I have designed web pages, however, I am from the old school of design and this style sheet stuff is all new to me.  If anyone has any good resources to make it easier to update with out learning a lot of code and loosing my elements, etc, please post a comment here.

Thanks..
Jennifer