Well, my vote should be obvious,,,yes.

When we used this type of challenge at Dundjinni the category topic was usually broad. "Fantasy furniture" as opposed to "Fantasy Couch" Having a wider topic range will get more people to participate. In some cases the topic can be specific if the item is something that is used a lot such as the challenge to make a compass rose. There were a lot of people involved in that one because compass roses are used on many types of maps.

I like Korash's idea that the object be presented in multiple versions, but that there should be a limit ( like 6 as he suggested ). One time at DJ we had a contest to make tables. My ocd kicked in and I posted 35 tables! Kepli kindly informed me of the 6 item limit and I had to delete 29 tables.