These 'STAP' speeders were easy too once I had cross referenced the colours from a source book. They did come on blocky, printed bases but I had the idea of mounting them on transparent brush bristles. This worked well, as I could make them fly a lot higher and adjust the flying height too with different lengths of bristle.
Simple little paint jobs but effective.
The stones add character to the base and give it so weight. They also help to secure the bristles.
The skeleton horde contrast technique works really well, any touch ups can be done with iraqi sand from Vajello.