Thor #201 is a superb cover by Kane and inked by Vince Colletta. I am not the biggest Colletta fan, but I really like his work here. Maybe because he inked Kirby's Thor for so many years?
Here is the full color cover as originally published in 1972. I love how Pluto's axe spills outside the rectangle and over the Thor logo on top. This type of image really suited Gil Kane, who loved to draw fantasy and barbarian type characters.
Thor #237 was a collaboration between Kane and John Romita Sr. Ulik plows Thor into the side of a bus while a crowd looks on in horror. Not the greatest cover, but a good action shot.
The original color cover as published in 1975, along with the often used Marvel quote:
"...Not All My Power Can Save Me!"
Remember when covers used to be great action scenes like this one? Nowadays the covers are more like movie posters, character poses, thematic covers that convey little about the actual content. Nuff Said!