I have uploaded some PowerPoints I have made which can be downloaded for FREE from the TES website.
The first is a PowerPoint on Planting a seed (which I am going to be using again next half term). It is a step by step guide to planting a seed and had widgit symbol instructions which are accompanied by photographs and you can get it here:
The other is a mini beasts PowerPoint which is really simple and uses symbols. It includes a chatter mat within it for discussion and has some basic info on where to find mini beasts which is useful when conducting your own mini beast hunt (which kids love!). You can find this one here: http://www.tes.co.uk/teaching-resource/Science-Minibeasts-PowerPoint-6171499/