A quick search of I2C in projects off the main site turns up a number of projects using I2C. The I2C interface would normally be on the CPU such as the Arduino or PI rather than in fritzing. If you are looking for a I2C level translator, from 3.3V to 5V there are a number of them available on Ebay. For Wali: I2C is a connection protocol typically used to connect a CPU to a low speed sensor similar to SPI, except much slower.
Peter Van Epp