Divide class into groups. They have a set amount of time to write 15 facts/pieces of vocab etc onto each balloon. They have as many balloons as there are topic areas (They blow them up themselves). When the time is up, they then have a limited time to build a tower with their balloons and sellotape. Tallest tower wins. At the end, they could use the vocab or facts to relay the information back to you - for points of course! Obviously this could be adapted and I look forward to hearing how you use it - comments please!
Great revision idea!