Last night, I had a regular dream in which I was a genie, or a djinn, whichever. I was with my family and we were in this survival game. I was the only one who could do magic, and I kept conjuring stuff up with rhymes, or making things happen. Lets say, I wanted a big purple bed:

Ontop of these leaves, brown and red
Will appear a big purple bed!

I would just say that and it would appear. It would also work for changing things. Let's say I wanted to turn a rock into an apple:

Instead of a rock, hard and dead
Make this an apple, shiny and red!

It worked perfectly for me in the dream, and since I know it works, i think I would be able to use it in an LD. You can also change a theme of a room. Let's say that the bedroom theme was princess, and you wanted it modern and cool.

Make this bedroom modern and cool,
Instead of princesses, whom in this bedroom rule.

I think this method would work great, as it did for me. I am going to try it out the next time I LD. I am pretty sure it would work though, as long as you can rhyme. =D