That first search is one of the things that got me to search my family history further on my own. I have accomplished a small amount of what I hope to one day but I feel like I have enough information to make my own coat of arms.
Below is my second rough draft. I haven't drawn in years but it is my hope that if I take my time it can grow to be impressive. This draft took 30-45 minutes not including the extra research.
This version has a basic shield. Most countries of note had shields that you could identify with them throughout the years. My final draft will be using a shield from 1760 Germany. The double headed eagle often symbolized the joining of two forces. In my case I chose it to symbolize my marriage, a clover on the left for my Irish heritage and a Fleur-de-lis for my wife's French heritage.
The seven inside boxes are for my eight great grandparents and how I chose to recognize them or what their heritage gave to me.
Moose- Both of my paternal grandparents were born in Maine. Maine's state flag has a moose sitting under a tree. Needless to say, I have some more research to do. (Nelson-Stevens Line)
Cross- The cross is for my Swiss heritage, Mender (Minger) Line
Mining Pick- The mining pick is for my Essex heritage, that owned several coal companies in southern Ohio
Red Cross- The red cross is for the line of my family that hails back to Donegal County, Ireland (Smith Line)
Eagle- The eagle represents Germany for my Eberts Line
Clover- The clover represents another Irish line in my family (Ryan Line)
Bare Arm- A bare arm in heraldry represents hard work, the Rains Line was built upon manual labor as any I've studied.
The middle circle is representative of me. The laying stag stands for peace and harmony, a creature that will only attack when provoked. The oak tree usually stands for strength and nobility, for me it is for my research into genealogy and loyalty to my family. before, now and forever.
Give it a try yourself. Coat of Arms can be as difficult or simple as you wish and there are plenty of resources online at your disposal.