I've been in a bit of a Mario mood lately, and I felt like doing something really retro, so here we are! This whole piece is dedicated to cast of the first Super Mario Bros., and I tried to keep everyone looking really retro here!
This brings up two thoughts, looking this over again.
First, at least outside of games where they have eyes, I never actually thought of the fireballs that jump out of the lava to be actual named "living" enemies (I just thought of them as fireballs.
Second, this reminds me that the game manual states that Lakitu throws "spiny eggs", but I never really thought of them before looking that over, as being anything more than "spinys rolled up in a ball".
Well, that's the color scheme that Bowser had on the original art that Shigeru Miyamoto drew for SMB1: [link] and [link]
He didn't get any official art with the colors we know of today until the following year when The Lost Levels came out in Japan (which is also when most characters got the designs that pretty much stuck with them to this day, more or less): [link]
I'll admit, I kinda combined aspects from both SMB1 and Lost Levels when drawing this up, though.