Everyone's favorite time of the year is the holiday season. Everyone. (Even if you don't want it to be because you don't celebrate holidays or something like that.) I think the reason is because everyone is uplifted and jolly all the time!
Inkscape is also widely used by a lot of people, many of whom have created tutorials showing you how to use the software, and that makes it even easier to download a piece of vector clip art and use it in your project.
Pixabay's description of themselves is pointed and very clear. No technical jargon or fancy words to let you know that they offer free images. Their website says "Finding free images of high quality is a tedious task - due to copyright issues, attribution requirements, or simply the lack of quality. This inspired us to create Pixabay - a repository for stunning public domain pictures. Your source for free vectors, free drawings and free photos. You can use any Pixabay image without attribution in digital and printed form, even for commercial applications."