Further to last post thought I would add this wonderful light toy that is designed for under water e.g. in the bath, but works equally well outside. It can be used for exploration of for themes e.g. light, stars etc.
It projects well onto ceiling and walls but even better onto close surfaces e.g. an umbrella or chiffon or indeed both as in one of the photos. I placed it in a large shiny Ikea fruit dish that reflected well.
It can be purchased from specialist SEN retailers or ebay and Amazon, search around under the heading "under water light show" the vary in price from £5-£50 (depending on size/ amount of light sequences/ or just difference)
Here is a link to the one featured here (possibly not the same retailer)