A baby crested gecko. They can live in room temps without extra heating elements. They don't need insects. They can eat a powder-water mixed diet. You may have to mist every few days depending on your location, but definitely not an everyday thing like balls. And they come in a variety of morphs and make nice display animals. I just suggest getting a conversion kit for your 10 gallon to make it sit sideways so there's more height if you go this route. The kit is really cheap.
Though, I'm not too sure how an adult will do in a 10 g. It can thrive, but more room will be optimal.
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