A neat addition to the space bugs could be some infected troopers. Slowly overtaken by parasites, their appereance changes to something bug like.
Bug like heads, clawed arms (maybe an extra arm or two?), optional spikes or chitin plating covering some parts of the hosts body could lead to some crazy looking models!
Also bandaged armstomps, cracked armor and torn clothes would give it a gruesome last stand look!
