The double bed: from Exotic Elements. (Under Traditional) The single bed: requested by BlueSoup and done by me. It’s slaved to the double bed and will pick up Maxis bedding and any bedding recolors you have.
If you’d like the single bed, make sure you have the double bed - and get the single bed at Sims2Artists.
Pic courtesy of kiri! Which brings me to a little NOTE: The double bed requires PETS (which I don’t have installed), while my single version doesn’t. (I plan on making a basegame version of the double bed sometime… soonish.)