The first digital image is one that I edited for use in Out to Learn's logo.
A Google search for "acorn" with additional parameters of "black and white" and "available for any use, including commercial" yielded this image, from https://commons.wikimedia.org/wiki/File:Acorn_(PSF).png:
I cropped, rotated, resized, and recolored acorn "A", then added text to create this logo:
The second digital image is one I created from scratch for use in my infographic about the Next Generation Science Standards. Using Microsoft Publisher, I created the basic shape and positioned the text, and I used the eyedropper selection tool to match the three colors from the NGSS logo.
To create the three-dimensional effect on the triangle, I saved the image and then opened it in Paint to make use of the fill tool, which doesn't exist in Publisher.