P.S. On your flamer I recommend some undiluted brown ink on the front half of the nozzle of the flamer, and then on the front half of that some undiluted black ink. A simple tip for making flamers look great.
You could even go further and use the top knot from a CSM/Ork or something similar as a lick of flame coming from the flamer.
I tend to use topknots from extra CSM heads for my flamers. When it's painted up well, it looks great. Remember that flame is hottest at the center, so you actually want to start with white or yellow, and highlight out to red (which feels wierd just because you're getting darker as you go out, unlike what you do with most highlighting) but it's more realistic.
I'd try to keep your bases fairly uniform across the army. If you want to do a lava/fire-themed base, go for it, but I'd repeat it across the army so you've got a consistent theme and appearance.
you could go for a lava base, but imo it has nothing to do with a flamer...
you could do a regular base with a half molten and charred tyranid!
paint the nid bits the regular colors then drybrush brown, then black.
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