I just wanted to say that reading all these posts and seeing all these tanks has convinced me that small tanks are perfectly okay as long as the fish is being cared for properly. I've only been around here for a few months now, but in this community it quickly gets hammered into you that you need huge tanks for Bettas with all kinds of expensive equipment for them to be healthy and happy or you're being cruel, and people will yell at you. As long as your animal is happy and healthy and has enough space to swim around and fulfill all its needs, the tank size doesn't really matter. It makes me feel better about the fact that I accidentally got 2 gallon critter totes instead of 3 gallon critter keepers. They are smaller than what I thought should be the minimum for a Betta, but my girls are perfectly fine in their 2 gallon homes. And there is nothing wrong with that. They have space, plants, a place to hide and feel safe, heaters to keep warm, good food, regular water changes. They have everything they need including my love and attention. So the size of their tank doesn't really matter.
A lot of these set ups look really nice, too, and still have plenty of space for the fish to thrive. I may use some of these ideas at some point. I really like a lot of them, and they would work well for my limited space if I decide I want more Bettas. All my Bettas have their needs fulfilled and are doing well, so I see no reason to avoid getting more just because I can't afford or make room for any more large tanks. As long as I can provide everything the fish need and change their water enough, I can definitely have more happy, healthy Bettas in my limited space.
Thank you guys, and keep it up with the awesome tanks!