Death Guard conversions, eh? I have a few. Well, three.
Here's a pair of PIP Plague Marines I kitbashed from the CSM kit, the Possessed kit and other bits and pieces.
And here's my WIP Foul Blightspawn, Rikketus Polp the Brewmaster.
The drum on his back is made from a cut-down barrel, a Nurgle CSM Icon, a tank cupola and a marble, with plenty of skulls. His legs are made from bits of Genestealer and Hormagaunt from my earlier days in the hobby. He still needs some pipes and other mods before he'll be painted though.