Hi there, Molly! :D
They have threads set up where you can suggest new item ideas! Here are the links:
Contribution item suggestions -
http://www.menewsha.com/forum/city-h...-items-yo.html
Regular item suggestions -
http://www.menewsha.com/forum/city-h...ggestions.html
Male avatar item suggestions -
http://www.menewsha.com/forum/city-h...on-thread.html
And these three threads are all found in the
Site Feedback subforum :D
If you look at the first page of these threads, you can see what popular suggestions people have already made as well as some of the item ideas they picked and have already made into items!
The Menewsha staff are very nice and receptive to new ideas. We suggest a ton of different items, and they try their best to make them happen :D From what I heard, they try to release to items that make sense at the time, for example matching the theme of an upcoming event.
Hope this helps! Let us know if you have any other questions or would like clarification on anything *nods*