A variety of excellent classroom resources are available from Triptico. They work very well on the Interactive Whiteboard.
Triptico resources are accessed from a desktop application, free to download, so an Internet connection is not required to use the resources.
Try Find 10, perhaps as a starter. This allows you to show 15 statements, 5 of which are incorrect, students have to find the 10 correct statements.
Activities can be saved for subsequent use.
This is an application well worth exploring. The resources include timers, a random name selector, team scorers, also an excellent vocabulary activity, Word Magnets.