You can make any pic into an appropriately sized avatar without photoshop, etc.....I am sure that you computer guys know an easier way to do this, but this is how I do it (yes I did Janets tacky boob shot this way - at least it was censored)
find a pic you like and right click on it...
select "save picture as"....
tell it where you want to save the pic (e.g. desktop)and what format (jpeg if avail)
Then go to the icon of the pic where you have saved it (e.g. desktop), right click on it, and select "edit". This will open a windows paint editor.
Under the top menu select "image", and in the submenu "attributes" to find the size in pixels.
Then go back to top menu , select "image" again, and in the submenu select "stretch/skew". To decrease the size of your pic to acceptable pixel size, just put the % in the "stretch horizontal" and "stretch vertical" boxes (e.g. if your pic was 200x200 and you want to get to 100x100 pixels, enter 50% (in both hor. and vert. boxes to avoid distorting the pic....)
Save the pic by going to the "file" menu and pick "save" or "save as" ("save as" will keep the orginal size pic intact on your computer as well, and allows you to change fromat of your pic - e.g. gif to jpeg)