Mine was originally intended to be an Ice/Normal Gym. It has a reception counter in the front area around my PC (made with 2 Heavy Desks, I think) with a Meowth Doll on one and two people behind it, a Level Release in the small cubbyhole between them, and a Poké Ball Poster on the wall next to that. On the other side of the front area is an Elegant Desk with more people standing around it. A Solid Board gives access to the back area. There are couple Glitter Mats and a Powder Snow Mat in the middle, with my avatar assigned to stand on the Powder Snow Mat and another Meowth Doll next to me. Behind my avatar are two Gym Statues, Dad's Scroll, and 2 Icy Desks in the back corners. While access to my Flag may seem blocked, there's actually a Blue Warp Panel hidden behind the Icy Desk on the right that will take you behind the reception counter. You have to walk past the side of my avatar that doesn't have a Meowth Doll to get to it.
You can scan the QR code in my sig if you want to download it (click to enlarge if needed).