EDIT I changed the cover so this whole post is now outdated.
Finally had time to read your message more carefully. I did make both pieces of placeholder art. The differences in color are on purpose since the goal of the title screen is to look like a DOS game. So the cover is a full color piece, while the title screen is meant to look like a very old game. I actually made the title screen by getting the exact same text from the cover and limiting the resolution and pallete on Photoshop until I got the nice dithering I wanted.
Anyway, here are some sources:
For the logo I used this PSD ("Free For Personal And Commercial Use")
The background art is this painting, which I found while searching for public domain art but I just realized this is actually CC 3.0, meaning I should attribute credit! I'll fix that immediately.
The swords are from here ("Free for commercial use, No attribution required")
I understand you may feel bad that I asked about the things you were sharing here, but let me be clear that there is a lot of cool stuff you can do with resources made by other people, as I just exemplified. You just have to be careful with what resources you can share legally, and which ones you can't (like those made with art from commercial games). I'll be glad to help you make cool stuff, hit me up if you want to talk.