
Slotict's design archive has quite a few designs, others will post you lots of other links I'm sure. Only key difference with Carrera is that their curves are based upon 15 and 30 degree increments rather than 22.5 and 45 in most other brands - but that just requires a little tweaking. It's pretty easy to clone a design using any of the fre track design software packages, and adapt it a little to fit your track brand. Look for what you want in any brand of track and "research" the turns and other bits you like from all the brands. Don't limit yourself to just the Carrera designs you can find.
