These great-looking word clouds are super quick to generate - simply copy and paste your chosen vocab into the 'create' screen on www.wordle.net then press Alt + PrntSc at the same time on your keyboard, paste into PowerPoint and crop/resize as you wish. You can also right-click and select Save Picture As ... to make a separate picture file of your Wordle.
Also, if you install CutePDF you can make your Wordle into a pdf file too. Simply go to Print and select CutePDF as your printing option. A dialogue box will appear and you can save your Wordle as pdf there: http://www.cutepdf.com.
Wordles can be a fun homework activity too as many students enjoy being creative with them.
The Wordle pictured here is one I created in House colours from the revised behaviour expectations last summer for the school's new BfL policy. It is basic, but you can include much more detailed vocabulary and even copy a full text from which the Wordle generator will automatically enlarge the most frequently occuring words.