At first I was hoping to find a series of photographs / photo images on Freepik that worked well together and that could also support individual lessons and topics and subtopics. I had favorited several dozen such images, but I truly wasn’t feeling the love.

I broadened my search to illustrations, but still within Freepik. After a little bit of searching for various key words, I concluded that illustrations from author “Storyset” might suit this project well.

One advantage of using vector illustrations from Freepik, instead of photos, is I can change the original colors to match my branding relatively easily in Adobe Illustrator. I splurged on a Premium Annual Plan ($144/year) so I would not have to worry about crediting Freepik or the illustrator for each image I use.
Another advantage is all of Flaticon‘s assets are available through the subscription as well.
And another . . . Flaticon’s image editor makes it really easy to quickly test / change / edit colors within the vector-based images at least. You can then export in PNG, EPS, SVG as you please. As far as the Freepick images go — your ability to change colors online might depend on the source of the illustrations; I noticed that Storyset will let you change colors, but through Storyset’s own site, not through Freepik; I think they’ll charge you, too. Not sure.

Below is a shot of the current homepage with three of Storyset’s illustrations, plus three icons from Flaticon, all edited to fit my brand’s color scheme.
