Each to his own I say.
I think your bags sound lovely.
Personally not keen if dc come home with plastic tat but have resigned myself to nasty sweets, although I know one Mum who goes through her dcs party bags and chucks out the sweets before the kids see them.
One mum I know sent kids home with popcorn-on-the-cob in a microwaveable bag, which went down very well.
In the past I have had a cooking party, where the kids took home the stuff they had made, and a pirate party where I downloaded pirate themed puzzles and jokes from the internet which I gave out with a bag of chocolate coins which was also fun.
Once I gave out puzzle books (bought in bulj from book people) to all the children and only one child complained!
I still have nasturtiums popping up in my garden from the packet of seeds ds2 was given in a party bag 3 years ago.
So I think it is certainly possible to fill party bags with imaginative cheap stuff which is not crap.
Although I am noticing a growing trend for parents to give out one single party gift -- but maybe that's because my dc are getting older now.
eco party bags website looks good, although haven't tried it myself.