Ikea has a closet planner[0] that is actually quite good. It lets you visualize closet frames in 3D by placing them within a virtual bedroom, then add shelves, drawers and other accessories inside of them. Then once you're done, it can put all of your items into your cart or generate a shopping list.
It's probably ~10 years old at this point, so it would seem they've had long enough to see the writing on the wall and port it to a newer technology. OTOH I'm not sure that, even today, the stability or penetration of WebGL is comparable to where Flash was at its height (to say nothing of the available talent pool.)
I've taken a screenshot[1] so anyone who doesn't have Flash can take a look.