You defiantly cant go wrong with this theme for a children's party.Great for garden parties,just think paper lanterns,butterflies on trees,cover your garden in bright colours.Use bunting as banners,a really cheap way to make it is go to your local diy store and get as many samples of wallpaper,in as many different patterns as you can get away with.Cut them into triangles and attach to a piece of ribbon with a stapler or double sided tape.