Yes - open each of the photos you want to use, size them so that they fit along-side and/or above each other in whatever layout you require on your desktop. When your desktop is fully covered with photos, simply take a Screenshot using FastStone Capture. The screenshot will then appear in your My Pictures and you can choose to use it as Wallpaper.
Download and Install Pic-a-View32, then Register it as follows to unlock the Full Program - Reg Name ACD DENNIS, Reg Number 697654457. Please note, this is NOT an illegal crack, this is from the magazine Computer Buyer, July 2001.
Open a new Word document in landscape. Create a table with 1 row 2 columns. Put your cursor in the left cell you have created & then insert the first photograph. Adjust the photo size with your mouse and the shift key. Now put your cursor in the right cell and do the same with the other photograph.