Here are some resources that might be helpful as you work on school projects and what-not. I’ll add to this list as I find time! 🙄
Creating a free account here gets you access to a bunch of Creative Commons (CC-BY) licensed, black and white icons. (Now with photos, too.)
Easily find colorful icons to use in projects, many downloadable for free (with attribution), no account necessary!
The Photoshoppiest free image editor on the web. A good stand-in for heavy-duty image editing if you don’t have anything local.
There are many color palette generators online; this is one of them. Explore palettes generated by others for inspiration, spin the wheel on your own, or upload a photo to pull colors out of it.