Remember that frothy Cuckoo Spit (also called frog or snake spit) on my Pinks? This is the creature which emerges when the nymphs hidden in the froth mature. Length about 6mm.
It was half way up the door frame of my conservatory and stayed long enough for one shot before it just vanished from view - hopped away! They are capable of leaping many times their height and length. Some can leap up to 70cm vertically and accellerate at 4,000 m/s2 over 2mm as they jump. Some can jump 100 times their length. All in all well named as Frog Hoppers. Information from Wikipedia.
Photograph, cropped, taken with my Nikon Coolpix S9050
Picture produced using the Mac app PicCollage Lite.