My favourite approximate quote, from "burning in Water Drowning in Flame": Pink sun,pink sun/ I hate your holiness
To go with what Winston said:there seems to be indeed a constant personnification of the sun. Even from a mere grammatical point of view, it is often the subject of a sentence, being "tired", "doing" things... That's very interesting.
Black Swan: your colour search makes so much sense! I did notice an obsession for the colour red. I can't remember if which novel (maybe Pulp) this colour pops out so many times, it's like having a text with spots of blood all over it...
Not sure one can write a whole thesis on the sun alone, but an essay, definitely. There was another thread on this forum where Erik wondered why all the essays on Bukowski in school must revolve around women. Or sometimes, the father figure. We wondered what other essay topics there could be.
Because there ARE recurring words and images in Bukowski's poetry that you end up noticing. As BS said, primary colours. Danny Mac on another thread: windows. Now the sun.
On top of my head, one could also write on: flowers, roses, cats, blood, blank and/or dead faces, anal functions (yes indeed) psychic cannibalism, rooms etc. Stuff that are very present but are not as obvious (well, ok, cats are obvious...)
Mind you, I could even give you a pompous title to work with: "Flowers, sun and moon: the subversion of romantic tropes in Charles Bukowski's poetry". Now I need to find victims students to do the job for me :)