Clip Art Library
Great site to find any clip art that you could possibly need.
Clip Arts are great when you want to add a bit of life to a presentation or email. There are plenty of companies that offer clipart - at a price. You shouldn't need to buy one if your only looking for a simple image for an email or Slack comment.
The folks over at Clip Art Library has a large collection of clip art available at your needs. All the clip are for non-commercial use.
A quick search for "Snowman" produced 826,000 images - surely there's something that I could use.
Website Description
ClipArt are graphic elements used to create a design. In other words, this is a raster or vector picture that may have any graphic format. For instance, raster clipart comprises of photographs, drawings, which are composed of pixels, the scanned images can be also used here. A vector image is painted with the help of special editors, which are composed of curves and which may be edited at any time. Usually, they have EPS format.
Clipart is used to create a web-design, you can also draw up bills, posters, make cards, collages and wallpapers. Thanks to ClipArt and its individual elements, the new image is created including all the elements; it looks like it's a photomontage, a creation of the new design. At the same time, it will be a big plus if ClipArt goes without a background since you do not have to waste time removing it. What's the format of this kind of image? These are widely known PNG and GIF formats; the images can be saved both with a background and without it. There are also scrapbook kits for creativity, which consist of png images; those are a set of elements and backgrounds