ThrottleLock is a little app to lock your device. It will only be unlocked when a pattern is drawn on a grid of points. The Throttle lock also gives you sliding answer and ignore buttons as seen in the screenshot below. So, how does it works? Whenever your device goes into suspend mode (or standby mode), it locks the device. When you switch it on again, you have to draw a pattern on a grid of points.
Get this nice nifty application from here