I've been trying to get my head around making a theme options page for a few days now, but everything I tried didn't work! :( Finally, I found a tutorial and source files for adding a simple welcome message to your theme, editable in theme options. It's here:
I did try and do it from semi-scratch, following the tutorial, but kept screwing up something, so ended up just changing a couple of things in the original code and using it, and it works flawlessly.
Just wanted to share! And thank you Theme Forest! ;)