Good choice with the death korps. The schemes I´ve seen, are the ones the colonel said. But, I think the official one it´s in the WD, I dont remember the number, but it´s the one with the kroot on the cover.
I have my Death Korps painted in codex grey, with some black ink painted on, to tone down the color, then highlight with codex grey. You will have a hard time painting the skulls on the gas masks (If you are using the Steel legion models). I just finished painting all the skulls of all my army of totempf krieg.
Hope it helps. Good luck with your army!