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.