Excluding my own works, the two sources I have used for all imaging (such as the image depicted above of the Logo that spells [StormStream.net] casted over a stormy cloud) are as follows:

#1: Pixabay (So far, used entirely for the backdrops of the logos.) All images used fall under the Pixabay License depicted Below.

#2: Typodermicfonts: Superheterodyne Used as the main logo text for my channel, (Created by Typodermic Fonts, but the only place listing it now is on 1001 Fonts if you look further down that that same 1001 fonts page though, you will see the author listed as Typodermic Fonts, and licensed as "free")