If you're a fan of websites and e-learning courses that use illustrations, unDraw by Katerina Limpitsouni is a useful resource. According to her website, unDraw is "a constantly update collection of beautiful svg images that you can use completely free and without attribution." The open-source illustrations can also be uploaded in png format.
My favorite feature is the ability to choose the main color for each illustration. This helps to match illustrations with a client's colors.
unDraw also comes as an Adobe XD plugin.
Want to add some truly original characters to your e-learning or website? Take a look at the vector cartoon characters by GraphicMama. They can also customize characters (e.g., with company branding) or create new characters based on your needs.
I'm also impressed by the GraphicMama blog, "the place to read, learn, and get inspired by visual content, graphic design, and illustrations."
For example, here is a blog post with links to Free PowerPoint templates.
When making buttons in Storyline, I often make the hover standard 10% lighter than the normal state color. I make the down or visited state 10% darker than the normal state color. To help find the right heximal decimal codes for the lighter and darker versions of the color, I use a tool from CSS Font Stack.
Dribbble is an online community for designers to showcase their creations. While eLearning design is different from web and app design, there is much to learn from designers in other industries. Take a look at at my "eLearning Inspiration" bucket on Dribbble.
For anyone interested, I have a personal blog titled My Journey to Know the Savior where I share reflections about Jesus Christ.