You will need image design software to work with the images you have downloaded from these sites. Which software you use depends on your budget, with Adobe Photoshop offering enormous power at a hefty price tag. The free and open-source alternative, GIMP, is available for Windows, Linux, and macOS and provides plenty of functionality for designing greeting cards and other materials for Thanksgiving. Alternatively, if you cannot run image manipulation software on your computer, use a web-based solution such as Canva. Create a free account for basic functionality, or upgrade to Pro. We also have a list of free editors here.