Is it possible to make Unity 2D launcher icons smaller or larger than the default size?
There is a way to make the icons smaller, however the icons are surrounded by backlit that's always 54x54 px and you can't shrink that, it's hard coded. What you can do is this:
You can change icon size in 12.04. Go to the forums and see my post on this in the Desktop Environments forum
There is a little script to change the size of the Unity-2d launcher items. Download the script from the forums (you need to login to download the file).
Then make the file executable:
Use the script to change the size of the Unity-2D launcher item:
Here, I have used 32 as an example. You can use other icon sizes as you wish.
As of writing this answer, it is not possible to change the size of the launcher icons easily. Georgi's hackish method is the best possible way to change the icon size.
The feature to change the icon size is still not fully developed yet and hopefully, it will land in for 12.04.
The slider for resize icons - Launcher is not available in ubuntu-2d (Unity 2D) session. So I assume you are using Unity 2D.
An ascertainment of which session you use , would be
command in terminal.
If you want to resize the Launcher - Icons in Ubuntu-2d (Unity 2D) session you must "hack" some items manually.
Carefully read and carefully apply bellow changes.
Open the terminal and do
find this entry
and change the width to 52.
Save - close and then again
find the entry
and change the sourcesSize.width and sourceSize.height to 32
save - close the file and then again
find the section
and change the titeSize to 40 and selectionOutlineSize to 52.
Save the file and logout - login for changes take effect.
Enjoy and be aware that with an update in the future maybe (not for sure) these values returned to defaults.
This procedure was previously described here in March 2012: Changing icon size in Unity 2d Ubuntu 12.04.