And if you're not using NetBeans, searching the net for "MIDlet icon" gives tons of relevant results.
There are no new questions, but there may be new answers.
Joined: Jul 23, 2011
For the eclipse
Open the eclipse
Find your project
Find the Application descriptor
Now give double click with mouse left bottom in this
Find the label "optional" choose it, in the MIDlet icon box put the your icon path...e.g. C:\...
save your changes.