The International Fluid Power Society (IFPS), known for their accredited certification and training programs, offers a monthly safety poster that can be used in training and safety meetings, as well as on bulletin boards at work sites. The full collection can be viewed here.
The site also provides information about the IFPS's online hydraulic safety-awareness training program, which is hosted in conjunction with the International Hydraulics Safety Authority. Classes range from $69 to $149.
This month's poster addresses spill kits. It can be downloaded from the IFPS website. A smaller version is shown below.