Tiny, Green Bugs, similar to Grasshopers

Hello!
The intruders are only 1-2mm.
They are hoping.
They do not have long back legs (at least I cannot see them)
Their feelers I cannot make out.
I have spotted two bigger grey-beige in colour.
I have sprayed two times with insecticide but they seem unaffected. Actually I have not find any of them lying dead on the bench....
I believe they are grazing on my trees.

Do you have any ideas what are they and how I can get rid of them?
Here: http://www.flickr.com/photos/kentuckyranger/3683281653/in/photostream#/photos/kentuckyranger/3683281653/in/photostream/lightbox/
you can see something like the intruder BUT mine are all green.

Thank you for your attention!

Probably one of the scads of "leafhoppers." They are one of the sucking insects. They do most damage to food crops -- lettuce, beets, etc. -- but some suck sap from leaves of shrubs and trees. Damage is mostly cosmetic, though in some plants (I do not know which, but have never heard that common bonsai species are among them) they can pass on viral and other diseases.

Google leafhopper.

Here are pictures of the MANY varieties: http://www.google.com/search?q=leaf+hopper&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&hl=en&tab=wi&biw=1600&bih=731

That's the one! Thank you, Jim!
And I read that : "Damage by leafhoppers in foliage becoming dwarfed, crinkled and curled. The leaves also appear brown and chlorotic due to the toxicogenic effects of the leafhopper saliva" which is exactly how the leaves of my pomegranate (coming from airlayer) look like lately.
Since the "attacking enemy" is not numerous, I think I will try to find insect sticky traps. It sounds effective to me and I do not like to use chemicals for a third time.