A very unassuming website but BOY is it fun! Tagxedo works off the same premise as Wordle but provides some fun shapes to fit your word clouds into. I found this last year when I was getting my Pinterest on and made an apple shaped Welcome to Fourth Sign for my new class using their names. I also created a school bus filled with words and concepts that we teach in Fourth. This year I did the same, but I changed it to a star shape to fit with my outer space theme. The kids love looking for their names in the shape.
Give it a try!