Magnet ups with wood looking background - Aruba Dogs

I have a number of designs that I am using for Magnets. I am building a magnet and sticker store and am looking to do a few mock ups with dark wood back ground to show off the designs. I will be doing a general listing showing a few of the magnets as they are for sale and then show some mock ups of how they would look on cars, refrigerators. The problem I am having is creating the mock up showing all of the available designs. I've seen other sticker stores and their mock ups look realistic. I do not have the computer knowledge or time to try and create it myself. I ordered some background downloads, but placing each design in on the wood background doesn't look as good as examples that I have seen. I am attaching the style I am looking for. All of my designs (Aruba dog and cat themed) need to have separate wood background mock ups for each group. I plan to have dog magnets on a set (I have too many designs to be able to place on one background) and then cat on another. This is for the dog designs. I just need one mockup with all of the designs on it (if that is possible) not one for each design.