Can I reorder the ScratchPads?

Yes.  To do so, with all your ScratchPads showing, tap EDIT in the upper left.  Once in edit mode, tap and hold on the ScratchPad you want to move.  Once the thumbnail image enlarges, you can move it to the location you desire.  Once moved, release your finger from the screen and the ScratchPad will be dropped to that location.