The Basics- Use cold coffee, put 10 regular ice cubes into blender, pour milk & cold coffee in to just below top of highest ice cube (adjust ratio for your tastes), at this point I use caramel, chocolate, or some other flavored syrup to both flavor & sweeten, pulse blend & listen for no more ice cubes bouncing around (time in between pulses allows 4 remaining chunks to sink back down), at end give it about a 3 to 5 second 'on' blend...if its too liquidy use less 'liquids' next time. But if you don't get enough liquids in the blender its harder to get ice cubes blended. These make about 12 oz glasses of Frap.
Or find big cans of Cafe D'Vitta at Sam's or Costco (they have caramel, chocolate,...flavors) same directions as coffee drink except add 1 scoop (scoop that comes with it) and then add milk, blend (only use mix, ice, and milk. no reason to add flavors or coffee, unless of course you want to). They are great 4lb canisters of mix. By the time you figure out how many Fraps this $10 canister of powder mix makes, it is WELL WORTH IT!
Additional things I do: Add more caramel sauce to it, Mexican or regular chocolate sauce, a few coffee beans to blender for speckled look, add peanut butter, find the Dulce De Leche sauce in 'select' grocery stores...yum.
In my professional 'making and drinking' opinion, powders work better than flavored syrups to thicken Fraps and improve taste....Using powdered creamer IS NOT A GOOD IDEA, you will soon become tired of the 'taste' that comes from powdered creamer, try using some powdered milk.
For quick smoothies use same amount of ice cubes and 8 to 12 ounces of flavored yogurt. Use a vanilla or plain yogurt and add fresh fruits for a more customized taste.
Steal lots of BIG STRAWS - (McD's or Coffee Shop straws) haven't found that they sell the big ones in any stores yet so I just get a few each time I am at Starb*cks, Pete's, or McD's
This is not definitive...just a quick guide for my friends who asked. If you have a coffee shop friend get him to let you 'have' a big buckets of Big Train powder mix.