@stringy if youre talking about something you can actually play with drumsticks and brushes and stuff I havent messed with..

A few years ago I got a chance to play around with one of these for a time. 

Id say to start an Easy phone solution is an app like loopz which is basically just looped drum tracks.

then there are apps like this

Drum Pad Machine | Boom:

Now I use some software called Ezdrummer2 and an atom pad or keyboard..or even painting the drum midi on to the tracks.. But then youre talking about the need for a computer.  But it is the easiest for me.  I think you can link it with a drum kit as well...havent tried that though so its possible Im wrong on that part.

It seems like some of the tascam and zoom products have some drum type functions similar to a click track.

maybe not what you had in mind but possibly something youd be interested in.