Answer:
3D Glasses: REDANDGREEN
The 3D Glasses code can be used by any member.
Other codes may be offered for clothing, but will have limits, such as one use only or limited time. Codes can be found in the Daily Growl, in Moshi Magazines, and when you purchase Moshi Monsters toys and other items.
If you have a code for a clothing item, enter it on the Sign In screen on Moshi Monsters, where it says, "If you have a secret code, you can enter it here:" Then go to your Dress Up Room and the item will be there.