I, for one, like that idea and from what I read of the website, you seem to be of the same mind I am.
Some of the main reasons that I enjoy geldings more than the other genders is that they, in general, are just more mellow. Plus, they are more stress free when riding with a large group of people. On a large trail ride if you are on a stud, you have to always be aware not to get to close to other people and if a mare is in heat, you have to be especially careful. If you are riding a mare in the same situation who happens to be in heat, you can never be sure when someone else is riding a stud they don't have full control over. Not only is that dangerous for both horses, but for both riders and everyone else around too.
Anyway, I will gladly share some of my gelding pictures.
Big John: registered Percheron gelding that is green broke to ride and drive.
Buck: registered AQHA gelding (RIP)
Denny: grade AQHA gelding
Dobe: BLM Mustang gelding
Jesse: registered AQHA gelding
Pokey: registered AQHA gelding
Rafe: BelgianxAQHA gelding (bit of an older picture, he was just a weanling there, he's a yearling now)
String's Dagwood: registered AQHA gelding.
Jet: registered APHA gelding. He is one that could have made a good stud if he had some sort of productivity under his belt. He had awesome breeding and great confo, but he was an unhandled 5 year old when we got him. Not such great stud prospects LOL.
Flash: (sorrel) registered AQHA gelding.
Zeiner: registered AQHA gelding (owner name: Jason)
Zippo: registered AQHA gelding (owner name: Jason)
Snuffy: registered AQHA gelding (owner name: Jason)
And just for grins and giggles, here is our entire row of riding horses, all geldings.