Program Icons: Make your own....

If you don't like the 'blah' icon that came with your newest program, and you have an icon-making program like IcoFX, you can take any image you prefer, and resize it to 400 by 400 or less (so the editing program can work with it) and then you can convert that image into a new icon, file it in your icons folder, and then change to the new one from that 'blah' one that came with your program.
If you look at the icons in my screenshot here, you'll see that's what I've just done with the one for LibreOffice 4.1. Its original icon was very forgettable.
Making your own icons is fun, but you should remember that images with a lot of detail in them will not translate to a very sharp icon, because of the limitations of its size. So you should strike a balance between details and clarity
for optimal results.