This has been running really well for 7 months I say we ask for it.
In the meta post on the new themes it says,
But, what this means is that if one site has an element, other sites can pretty easily add it.
For example, the Photography site's Photo of the Week box could be added to Graphic Design to show off the users' designs if that site wanted to host such a weekly contest.
People seem to be enjoying the photography contest, would the photo of the week be something we would like to request here?
Update, I asked on the meta post, we will have to see how it goes.