There are no user-created objects yet, only some recolours and some hacks.
As far as I know there are only two recoloured objects - both clones of the Alienware PC.
Merola's Red Alienware @ http://www.simchaotics.com/Files/MerolaSims2/RedAlienwareComp.htm
Amberware's Cold fusion @ http://www.halfelf.com
The Alienware PC has also been hacked (changed Pie Menus, increased Fun & Social) @ http://www.modthesims2.com
but is mostly in Beta testing.