Lyrical does this so much better, but I thought I'd give it a shot. :)
Type: Open World
Screenshot of my Tinkapad: http://bit.ly/VxBOmN
You can decorate the inside & the outside. That's my Tinka near the bottom, doing a flip.
Game link: http://www.tinkatolli.me/
It looks like striatic posted about this almost two years ago: http://www.glitch.com/forum/general/4673/
Keep in mind that a lot has changed in the game since then.
I'm really loving this game, and I'm posting this in case someone else is desperately looking for another game they can lose themselves in.
The basic premise is that the Tinka's have a lot of junk wash up on their shores, and instead of being upset about it, they use it to create stuff. The junk is pieces of paper most commonly, but can be very rare items like socks or LCD screens.
From their FAQ: "On Tinkatolli, kids can play games, explore, collect, build, decorate, solve quests, view each other's offline and online creations, trade, hunt for items and level up through earning virtual badges that mark their achievements in the game. Tinkatolli is also a very a social game that lets children interact with one another by chatting, playing games, helping each other, exploring together, trading, giving gifts and visiting each other's virtual homes. Many players develop wonderful friendships with other players that are just as important to them as the friendships they have in the real world."
The game is marketed toward children, however, other than some safeguards (like the inability to type numbers in chat) I don't really see how it's more kid-specific. It is open chat, but you can disable chat, if you choose.
You get your own house, to decorate as you wish with items you find, or things you buy. I'm fairly certain that clothing is coming in a future release. They have an iPad (or iOS?) app, where you can create a Tinka & dress them. (Free) You explore the world, picking up junk & creating stuff. You collect Bling (little glowy blue orbs - think Pacman) for XP and more moves (i.e. Jumping, flipping, dancing, somersaulting, etc.)
Tinkatolli is free to play. They have membership options too - http://www.tinkatolli.me/membership/buy/ . Trinkets are equal to Glitch Currants. Seeds are the other in-game currency you collect & purchase things with. You can earn them from playing games (arcade games in the game), recycling, or picking up junk.
Pros:
Highly customizable avatar, even more so for subscribers
Your own space, expandable
Arcade games within the game
Special area for level 10+ (accessible with an item you can only make at Level 10)
Ability to submit items you create IRL, and they may be chosen to recreated in-game
It encourages offline creativity & exercise. You can even earn in-game perks for doing so.
Cons:
World is fairly small
Can get grindy if you let it
Difficult to add friends unless you see them in-game >:|
Anyway, I hope you'll give it a try. If you do, feel free to add me (if you see me - let me know you're a Glitch!). I'm Wyneener on there. :) I'll be happy to help you however I can.
ETA: They have in-game holiday fare. There is holiday junk to pick up, holiday unusuals to buy, and right now, there is snow upon the ground. :) So that's nice too. I love in-game holidays!
If you decide to join Tinkatolli, be sure to add your nickname to the Glitchen Games Spreadsheet: https://docs.google.com/spreadsheet/ccc?key=0Aq8E1odbRbYmdHBHUXZmVnNmWG5XRHNkekwtT1VtZWc#gid=6 Tinkatolli is listed under the Virtual World tab.