One of the things that I have had a difficult time with is layout of a post that contains a picture. I would like to wrap text around a picture to eliminate large areas of white space that normally shows up when adding a picture to a post. When adding a picture you do have the option of some minor formatting. These options do allow you to set a picture to the right or left, and with this setting, the text will wrap around the picture. This makes for a much better visual display of a post that contains an image. I do like this very much.
There is a very good YouTube video that describes, in detail, how to do this. It also contains instructions for some advanced formatting by using html code input. It is not extremely difficult, but it does require code entry. It is a demonstration within Wordpress, but I have tested the same process in Elgg, and it works exactly the same.