I've ported some of my projects to work with cgminer, and they work with some limitations. The same idea did not work with my little Nexys2 -- it's probably too slow. If you have a somewhat faster FPGA, you could try one of these
https://github.com/teknohog/Open-Source-FPGA-Bitcoin-Miner/tree/master/projects/DE2_115_makomk_serial_109mhz_cgminer
https://github.com/teknohog/Open-Source-FPGA-Bitcoin-Miner/tree/master/projects/DE2_115_cluster_cgminer
https://github.com/teknohog/Open-Source-FPGA-Bitcoin-Miner/tree/master/projects/Xilinx_cluster_cgminer
In the cluster projects, simply build with one local miner and total miners = 1 to get a standalone version.