There's a growing number of fan-made themes for the iPhone which, if you've been keeping up with Jailbreaking your handset and generally tweaking it, have offered plenty of options for personalisation.  However, one thing missing so far has been a way to flip between themes while away from your computer; imagine the horror at pulling out your iPhone to impress a lady when your arch-rival whips his out with - oh no! - the same Spiderman wallpaper!  Thankfully Greg over at ModMyiPhone is tinkering with an app called iSwitcher, designed to make on-the-fly changes simple.

So far there's no release client, but eventually it'll offer full-screen previews, side-scrolling and one-touch install of a chosen theme.  Nice work, Greg!