As you may already know, there are far more adventurous possibilities for theming your iPhone if it is jailbroken. Having been dissatisfied for some time with merely swapping wallpapers, I explored various theme packs on Cydia. This requires time and patience as some themes don't work well with other plug-ins and recently, I've stumbled upon PerPageHTML, which is a very cool alternative to Winterboard for those of us who like to install cool themes on their iPhones.
This is useful because it allows other widgets to be installed on every page and with the paid version of the tweak, overlapping widgets can also be installed. In my case, this allows me to continue using my LockCalendar tweak (a free plug-in that compiles my calendar entries) for my Lockscreen.
For further tweaking of the weather locale in the HTCAniPPH widget, SSH or use iFile to go into the 'var/mobile/Library/PerPageHTML/HTCAniPPH/configureMe.js' and substitute the default weathercode at var locale = "SNXX0006". (SNXX0006 is for Singapore, where I live). Your weather code can be found by going to www.weather.com.
The icons are from the Winterboard theme 'HTC Froyo'.