You want to create a new picture then in your paint program at the resolution of your desktop. You can specify the dimensions when you create it. Then open up the pictures one by one, use the highlighting tool to mark them, and copy and paste them into your new blank picture.
If you have photoshop or another professional program its really easy since it automatically makes a new "layer" each time you paste into it. This makes moving them around and editing them a breeze. You can still do it without layers, just make sure to save it often as going back to edit things can be pretty unforgiving.
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