Depending on your artistic skills there is GIMP, which is a Photoshop equivalent and its completely free. There is Logo Design Studio which may have what you are looking for but its commercial software.
I dont know of anything that is capable of designing web pages and also designing graphics in one package. Well at least do them both well. If they do both, they are usually minimalistic in their abilities.
I have always thought your site would benefit from the use of a Content Management System and there are plenty of free ones around that are very good, but do take some time to learn.
If you were looking for something more specific let me know and I'll see what I can dig up for you.
