Plasma is the component of the KDE project that actually displays the desktop (i.e. wallpapers, panels, etc) using 'containments'. The containments are capable of containing other widgets called plasmoids.
Get new plasmoids
You can get new plasmoids from kde-look.org.
KDEmod users can easily install new plasmoids from the kdemod-extragear repository.
Tips & tricks
Decoupling the Dashboard from the Desktop
The Dashboard is what shows up when you press the Ctrl+F12 keys (if Plasma is running and if you didn't change the shortcut of course). By default, this "brings forward" your desktop and helps address the "but I never see my desktop!" problem, explains Aaron Seigo in HOWTO: decoupling the dashboard from the desktop.
Create a new desktop
The first thing to do is create a new "Desktop" that will become our Dashboard:
- zoom out using the Cashew on the upper-right corner of your desktop
- find a button to add an Activity (you might have to unlock the plasmoids for this button to appear)
The second step is to quit Plasma so it won't interfere while we are editing its configuration files:
- execute Template:Codeline
Edit the files
We have 2 numbers to find in the following file, write them down: Template:File
In this second file we will tell Plasma to use the new Activity as the Dashboard of our Desktop: Template:File
You can now re-start plasma and press Ctrl+F12 or whatever shortcut you gave for the Dashboard to check if you did things right.