I've just used some old ball pool balls to net over some of our new seeds - it all looks very jolly down at the plot now!

But, having cut holes to poke the stick in I'm not sure if you would be able to use them if you want to put cross members in too without reinforcing the balls with a bit of tape...

It does look good though and much neater than plastic bottles (can you tell that I'm quite pleased with myself?)