UPDATE.. OMG i am getting so excited but was finding it hard to find things to put in the goody bags for boys, there are LOTS and LOTS of things for girls like butterflies etc but not much in the way of 'bugs' for cheap.
SO thanks to BG for her wonderful input the theme is now going to be AVA's IN THE GARDEN PARTY!

In my garden we get, butterflies, bugs, lizards, snakes, spiders, frogs!
I can now buy little packs of frogs and things to go in the boys ones..

So so far i am making the bug catchers (goody bags) myself as follows:
Round plastic container with lid, will use the lid as a base (so we can get things in and out)
Then on the base of the container which will now be the top i will have a toilet roll (as the thin neck of the bug catcher) then i will have a round bit of cardboard to look like the lid.... does this sound ok? am thinking of paint the base, the neck and the cardboard top green to look like the ones i had as a kid.

So far to go in them i have:
Magnifying glasses
Stickers - bugs & butterflies
Dragonfly Hairclips - girls
Butterfly Hairclips - girls
Mini bug & butterfly erasers - mixed

I found these cute expandable bugs n butterflies on e-bay, you drop them in water and they grow 80c each so got 4 to go on the table or for the kids to just play with.

Does all this sound ok, are there games you can think of playing for 2+, am buying bits n pieces as i go along... YAY can't wait... am working on the invites aswell... ohhh