you can resize most of your pictures by using your paint program or microsoft photo editor.

find a picture file or a clip art? and right click on it, it should have a list of options, go to -open with - and see what options pop up.
I had best luck with microsoft photo editor but if you have any other picture or photo program they will work too.

I can help more tomorrow if you need it- or somebody might have an easier way to help you figure it out.