How to run ios 7 supported apps on ios 6?

I have an iPhone 3GS and there are a few apps on the AppStore that only work on ios 7.Is there anyway I can run those same apps or download them to run on my iPhone? These apps are Dropbox and some games

You can try whited00r.
Make a backup first though.

It can't be done, apple does that on purpose to force its users to upgrade or buy a new device so they can make more money.