A few years ago I filled out a book of watercolour paper with whatever colours and textures I could think of, and scanned them for personal use. Hopefully other people will find them useful as well!
They fall under a Creative Commons 3,0 Unported license, meaning you are free to share and remix for both personal and commercial use, but I would love to know if you decide to use them and please share the results!
In my time working as a designer and illustrator, I’ve done many projects for clients who didn’t specifically request illustration, but I had included it as part of the design when I thought that it was more appropriate than a photograph.
Then, there have been instances where the client would give feedback; automatically dismissing the concept and asking to remove the illustration because they didn’t want “clip art.”