Thanks for the good vibes Sendak and Von Lucky.
I think I will keep the dragon fly on all my plastic marines. Bought them and started painting them a few years ago and although they are not the sort of thing i would get now, I feel like they deserve to be finished up. The sculpts are nonsense when you look at them closely but on the table arranged neatly in squads they look quite good, they are certainly more cohesive than my other armies.
I am gradually psyching myself up to do the old Tzeentch renegades, with the fungus bodies and so on. I think they will probably need a much lighter coulour scheme though so probably they will end up belonginng to a completely different Legion.