A few anime have bitten me on the arse enough for me to rewrite(ya I know) lyrics into something that flows better in English (ya I know).

Naruto 9th ending Nakush-ita Kotoba by No regret Life (in my top 5 songs still)
(remove -,I love mindless word bots)

Rurouni Kenshin - 4th ending - 4th Avenue Cafe by L'Arc~en~Ciel

Rurouni Kenshin - 3rd Ending - Heart Of Sword by Before Dawn (?)

Inu yasha Shinjitsu no Shi-(Song of truth) -5th ending by Do As Infinity (in my top 5 songs still)

Inu yasha My Will 1rst ending by dream

Inu-Yasha Fukai Mori (Deep Forest) 2nd ending by Do-As-Infinity

FUll metal Alchemist Rewrite 4th opening by ASIAN KUNG-FU GENERATION

FUll metal Alchemist I Will 4th ending by Sowelu

Trigun ending (just gotta do it in a slight country twang,I keep imagining jonhy cash sining it :3 )

Yes I know some of the inu ones have enrigsh versions but I am not satisfied with them.....anyway these are the main ones that have not let me go over the years I have Narutos 80ish% complete I think I can reword it some to be happy with it but crap my grammar ain't that great :P

I usely take translation notes from each translation of the song I can get my hands on then hammer out something that flows well in English or something like it *L*.