FruityLoops is a great tool for prototyping and sequencing but when it comes to mixing or laying down guitar tracks nothing beats Ableton Live. A quick and dirty way to import loops in Ableton is as follows:

1. create a new MIDI track. Call it “FLP Studio”. Drag in the “FL Studio VSTi (Multi)”.
2. create a new AUDIO track. Call it “P1-drums” (assuming you are going to capture the drums from pattern 1 in FLP).
3. Set the input of the track to be the “post mixer” for 1-FLP-STUDIO
   
4. Double-click the FLP-Studio track and hit the wrench to open FruityLoops:
   
5. then hit again the (acorn?) to start the main FLP interface.
6. Load your project in FLP.
7. Select “pattern mode” in FLP (click on the “PAT” LED):
   
8. Back in Ableton, arm the “P1-drums” track for recording.
9. Arm the main recording function.
10. Press “play” and let it run for at least double the size of the pattern
11. Your FLP pattern should be recorded in Ableton Live.
12. You will probably notice that there is some silence at the beginning of your pattern (at least I had this problem). Seems to be because a lag between Ableton and FLP. Solution is to crop the first iteration of the pattern (this is why it is important 2 record at least twice the size of the original pattern).
    
13. Rinse and repeat for each FLP pattern.

I know this is a bit tedious and it also assumes your patterns in FLP are pretty clean (ideally you have only one instrument in each pattern). But this avoids having to run FLP as a plugin in Ableton (or to introduce Reason and Rewire), which in my case is almost impossible since FLP is so CPU-hungry (which introduces cracks and distortion in the overall mix).

I’m sure there are more clever ways to achieve the same result, using drum racks and channel recording but I haven’t had a lot of success with this (if you know of good instructions please add link in comments - thanks!).