OK.
Resizing logos to 36x36 for Blackberry using The GIMP
First, open up your image in GIMP, going File > Open then navigating to the image:
You should get something like this:
Find Image > Scale Image then select the following settings:
Then, find Image > Canvas Size and select the following settings:
Make sure that the 'link' is broken and that you select 'center'
Then go File > Save As. Choose the location and file name and hit save, making sure it is saved as a .png
Select OK to the PNG settings page.
And you're done.