The best advice I can give is to spend some time reading through the various posts in the forums, and using the search function. It may seem daunting at first but as you read more of the information you'll understand more about the questions you are asking and will find the answers easier.
You'll find there are two different areas you are asking about in your post. The themes are just various color schemes (and backgrounds in the today screen) for the mogul. There are also various today screen "add-ons" that provide additional functionality, such as the clocks and the weather plug-ins, some are free, some are not, and you'll get just as many opinions (if not more) about which one is best as there are different versions of each of the plug-in's out there. (everyone has there own opinion on what features they like on a particular app).
For the free apps, search for an find the one's you think you might want to try and give 'em a run, then settle on the one you like the best.
Good luck hunting and good luck with the new Mogul.
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