Gram Positive Bacilli: Spore formers

Spore formers.
When playing Spore, you find a blue crystal.

Blue - bacillus
Crystal - Clostridium

And look, the blue crystal is kinda rod-like in shape. So bacillus.

OR, to remember CLOSTRIDIUM, think of spores coming out of a CLOSet when you open it after a very long time.