If you don't have access to image processing software, you can use Microsoft Word 2013 to merge some pictures and create interesting effects. You can overlay parts of the images or place smaller pictures over larger ones. By default, you can't merge the images after you import them into your document because their default layout option is "In Line With Text." However, if you select the "Square" option, you can merge the images after you edit them using Word's built-in set of image editing tools.
Click the "Insert" tab after you open the document in Word and click the "Pictures" button in the Illustrations group to display the "Insert Picture" window.
Select the images you want to merge and then click "Insert." You can select several images and import them all at once by holding "Ctrl" and clicking each item. If the images are in different folders, repeat the procedure until you insert all of them into the document.
Resize each image by selecting it and then clicking and dragging the handles in its corners. To rotate the image, use the rotation handle at the top of the selected image. Crop an image by selecting it, clicking the "Format" tab under Picture Tools and then clicking the "Crop" button in the Size group. Drag the cropping handles and press "Enter" to crop the image.
Select each image, click the "Layout Options" button that displays near its upper right corner, and click the "Square" icon in the With Text Wrapping section. The Square option allows you to merge the images.
Click and drag each image to reposition it. You can place smaller images over larger images or just overlay parts of the images. To bring specific images to the front, select them and click the "Bring Forward" button in the Arrange group on the Format tab. The "Send Backward" button sends the images to the back. You can still edit each image individually until you are satisfied with the results.
Select all images by holding "Ctrl" and clicking each picture or by clicking and dragging with the mouse, select the "Format" tab, click "Group" in the Arrange group and then click "Group." Grouped images act as a single shape, so you can easily move them without changing their position. Press "Ctrl-S" to save the changes.
You can undo changes by pressing "Ctrl-Z" if you are not satisfied with the result of a crop, resize or effect.
After you group the images and they become one object, you can resize the object or apply various effects to it. You can also crop it as you would crop a normal image.
Click the grouped images, click the "Layout Options" button and choose a different layout option that suits your needs.
To add effects -- such as shadow, reflection or glow -- to an image or group of images, select it, click the "Format" tab under Drawing Tools and then click the "Shape Effects" button in the Shape Styles group. Add outline effects by clicking the "Shape Outline."
You can insert images from online sources by clicking the "Online Pictures" button in the Illustrations group on the Insert tab. Type the keywords into the "Office.com Clip Art" or "Bing Image Search" field and press "Enter" to search for images. Click the images you want to import and then click "Insert."
To insert images from Web pages, right-click them, select "Copy" from the context menu, open the Word document and press "Ctrl-V" to paste them from the clipboard.