Ralf Diederiks

Any photoshopping program should work fine. I made the cover for this using nothing but adobe programs (I recall one being called Adobe Photoshop). However, everything I did with it is probably just as easy to do on free programs like GIMP 2. If it doesn't have all the effects you'd like to use (which I doubt), you can always download more plugins to go with it.

There are plenty of drum loops available on sites like freesound. Oh, and you can use a DAW to change the bpm, if desired.