I have created a coffee mug, it is not the best mug in the world, but it is still a realistic creation, and as my second creation using this software i believe that it looks pretty good, although as i progress through using Blender, i will be able to re-model the cup, and have design patterns on it that the tutorials did not do.
This is what the final piece looks like:
There are some flaws in the cup from where i missed some connections to the cup and the handle, meaning that it is at an angle and not attatched properly.
I used a tutorial that is in two parts and i thought that is was so clear on what it was telling me to do.
http://www.youtube.com/watch?v=y__uzGKmxt8 - Part 1
http://www.youtube.com/watch?v=ChPle-aiJuA - Part 2
The tutorial creator was tutor4u, and he does many videos showing how to create different realistic models in Blender and i recommend using these tutorials.