I don't really know where you can find such information other than just looking at a flight tracker.
Of course if you want to know what common flight paths are at least in the United States, you can look at a sectional and draw lines between different VORs and that pretty much will be where a lot of the planes are flying.
If you have never designed an airplane part before, let the real designers do the work!
If you're near a local airport with a pilot center, you could buy some low altitude or high altitude enroute charts for the Jet Airways and Victor Airways. That would give you some idea of the main airways used. You may also look up something about these airways online.
Quoting CO787 (Thread starter): Does anybody know where I can find some maps of the more common Flight Paths/Patterns through out the world? Thanks in Advance!
Don't know about the "world" part, but here in the USA, you can go to www.flightaware.com and look at traffic in/out of various airports, and it also provides the flight plan routing that had been filed with ATC...
ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.
I don't know if you are talking about general aviation or commercial operations, but you also may want to check out some High Altitude Charts. Do what BBJII suggested and check with the Jepessen office, they usually will send you some old charts at a pretty good price!