Since the Fritzing come in the spirit of Arduino, I think that it is good to include open source FPGA boards like Papilio in the parts library of the Fritzing. The board uses a modified version of Arduino IDE which is called DesignLab. The DesignLab is essentially Arduino IDE with the inclusion of toolbar for calling the Xilinx ISE program. I am specially concerned with Papilio Pro model that is constructed using Xilinx Spartan 6 LX9. I flashed a soft processor which is called ZPUino into the board and then start developing code using Arduino IDE library.
It will be great if you include this line of products into your parts library.
Please visit http://papilio.cc web site. they provided the Eagle file of their Papilio pro in their download section.