R3 users
Moderators: Sharp, X-Trade, Pepperpotty, karmathanever
Get the creative juices flowing? Play a guitar! 
There are many, many more qualified people on this site to take a stab at this very general question you are asking but I'll give it a shot.
I think I know what you are getting at here- when you have basic beat going then you can be "free" to create melody on the R3. I'll assume you have a computer since you are on the forum so a cheap solution is to download something like Ableton Live which allows full operation in Demo mode (demo means you can't save your work). They have a simple tutorial on creating beats, and you can loop them, layer them, play with virtual instruments etc. This is all just to get the creative juices flowing so to speak, and hopefully they will upon improvisation.
If you want to save any work then you of course need to make a little bit more of an investment.
The kaossilator is not many things, but one things I have found it is great at is getting the creative juices flowing with its simple loop functions and easy layering of beats- not a free solution though. For pure beat looping, anything beyond getting the creative solutions flowing would require a midisync to nail down the timing.
Juices flow the more you play, so have fun!
There are many, many more qualified people on this site to take a stab at this very general question you are asking but I'll give it a shot.
I think I know what you are getting at here- when you have basic beat going then you can be "free" to create melody on the R3. I'll assume you have a computer since you are on the forum so a cheap solution is to download something like Ableton Live which allows full operation in Demo mode (demo means you can't save your work). They have a simple tutorial on creating beats, and you can loop them, layer them, play with virtual instruments etc. This is all just to get the creative juices flowing so to speak, and hopefully they will upon improvisation.
If you want to save any work then you of course need to make a little bit more of an investment.
The kaossilator is not many things, but one things I have found it is great at is getting the creative juices flowing with its simple loop functions and easy layering of beats- not a free solution though. For pure beat looping, anything beyond getting the creative solutions flowing would require a midisync to nail down the timing.
Juices flow the more you play, so have fun!
Owner of R3, nanokey, and Kaossilator- and some guitars.
Hello. Vibedog has offered some good suggestions. Another inexpensive option is to get a good ol' drum machine. You can get them pretty cheap these days. There's been a shift from drum machines over the years but I still use mine from time to time... 
Korg TR61 w\EXB-SMPL board\64 MB RAM, Korg R3, Korg Mono/Poly, Ensoniq EPS 16+, Yamaha DX7, Roland RD-300s.
check out my music at:
http://www.soundclick.com/pro/default.c ... tent=music
ON THE ULTIMATE WISHLIST: Korg Oasys
check out my music at:
http://www.soundclick.com/pro/default.c ... tent=music
ON THE ULTIMATE WISHLIST: Korg Oasys