I have been looking at Kew Gardens millenium seed bank website as inspiration and also found some fantastic images of seeds for the book "Seeds - Time Capsules of Life"

millenium seed bank The MSB and its partner seed banks are not mausoleums - the seed they contain remains alive for decades and, in many cases, hundreds of years. More importantly, that seed is being used now to provide a wide range of benefits to mankind, ranging from food and building materials for rural communities to disease-resistant crops for agriculture. The collections held in the MSB, and the knowledge we are deriving from them, gives us almost infinite options for their conservation and use. With future climate change scenarios and the ever-increasing impact of human activities, the MSBP is already looking towards the next 10%. http://www.kew.org/msbp/