Hmm, here is one where you can sign up for free and play.
Roblox, a 3D virtual world where you can build or play games, and customize your character.
I don't know how much "Christmas Money" you have, but you can buy Builders Club, which is like membership, and Robux so you can buy gear and clothing.
If you decide to play Roblox, pm me and I can show you around.