A simple VGA interface can be built on a breadboard with some resistors and a connector. The red, green and blue VGA signals are each driven by a simple DAC like the one shown below. Each color input presents a 75-ohm load to the DAC. The DAC resistors combine with the load resistor to divide the 3.3V digital logic outputs so the total stays below the maximum 0.7V expected by the VGA input VIA

This prototyped a 512-color VGA interface board which worked just fine, but he thought it would be way too cumbersome to use for each and every project. To keep life simple, he designed a small PCB that integrates a VGA connector and all of the resistors he needed to get the signal from the FPGA. His boards plug directly into a breadboard, so only a handful of wires is needed to connect the FPGA to a monitor.