I've seen videos like this one in which a effect appears when the user made a click. What I want it's just the effect only, I don't care the colour of the cursor.
How can I make this effect when I do a click in Ubuntu 11.10?
As indicated in this very similar question, your best option appears to be using keymon; it is fairly easy to customize it for an effect similar to what you see in your video.
1. Install keymon
From the Software Center, or via
2. Make its window minimal and enable the click indicator
3. Customizing the mouse-click indicator and making the KeyMon window disappear
You can achieve a similar thing with the Water effect in Compiz.
First watch a video about it (grabbed it on youtube): http://www.youtube.com/watch?v=7pcLv8XuGKM The results on the video may look like that it's not what you want, but you can change the settings later after you had enabled it.
Then definitely read What are some of the issues with ccsm and why should I not use it?
First, install Compiz-Config by searching it in the Software center.
Then, open the program by searching CompizConfig Settings Manager.
Search for Water Effect and select the option
Enable the effect, set a custom shortcut by clicking the option on Initiate, then click on the shortcut that you assigned, then have fun!
The effects might not be the one you wanted, so fool around with the 2 sliders until you like what you saw.
You can install key-mon which apart from showing the mouse clicks,can also show key presses.For locating the mouse-pointer you have to run the command:
Without having to install anything, the only option is to enable "Show position of pointer when Ctrl is pressed"
Press Ctrl and an orange radiating circle should show the position of the pointer.