Are these seeds?

I had these posted on the insect forum, and someone thought maybe they were seeds instead of pests -- are these familiar to anyone?

Photos taken just this afternoon in Southeastern PA (Bucks County). The petunias all have them -- 4 planters full. The flowers keep getting holes/dying off -- nothing seems to be crawling around/moving, but there are lots of these small "things" all over. In 3 of the 4 planters, they're in with celosia. In the 4th, they're in with another flower (can't remember the name but photo included at my original post here: http://davesgarden.com/community/forums/t/894907/ ).

The 3 planters are up on the fence (the 4th is down on a table). I've been keeping the weeds down in the yard (used to let them grow big big because they were pretty and the birds liked the growth but they were cleared out this spring), so nothing's bloomed in the immediate area -- but I live in a condo development and my unit's right by protected wetland with a stream and lots of trees/bushes/etc. -- all different growth within 20-40 feet.

I have vegetable plants in containers in the yard, too -- bush beans, snow peas, carrots, tomatoes, cucumbers, mint, basil, cilantro, mesclun, pimentos -- nothing's really done yet, but the bush beans and snow peas are probably closest to done.

Familiar as seeds? They're tiny -- about the size of poppy seed maybe?

Two other photos also at the original post: http://davesgarden.com/community/forums/t/894907/

A friend just informed me that they're (big surprise, huh?) petunia seeds!

What a fab clear photograph, just show you what nature can do for us eh, your plants have been allowed to go to seed, that is, you have not dead headed or dead headed enough, all flowers make seeds it is what they do, but with the likes pf petunias, we the grower have supposed to prevent this to trick the plant into believing it has still to make more flowers for seed forming this is so the plant lives on another year, so we dead head thus removing the flowers when the flowers start to flop or die, this way we prevent it from making seeds, all plants that make seeds get weakened and tired out so they realise not to make any more flowers and stop, this is what is happening in your case.
The little holes you have spotted are making you confused (easy to do when you think you you see signs of insects, but the holes are not part of the seeds forming, the holes are totally different and can be caused by a number of insects, either ear wigs that only feed at night so you very rarely see them unless you look for where they sleep in the day
(normally under the foliage, tucked right in the middle of the flowers etc or even on another plant close by) but other things like green fly, which you will see as there are normally hundreds of tiny green insects, or cater pillars, or snails/slugs, but there are too many to mention really, if you have only a few holes, I would not worry, but if the plant is being ruined, then you really need to search either evening or early morning where most will be active, by finding this out, I am sure we could help you identify what exactly the bug/insect it. good luck WeeNel.

Thanks WeeNel!

I actually deadhead all the time, so I'm not sure how that would happen.

There have been plenty of insects out there -- I'll see if I can track down who's causing the holes, but the plants are still looking strong so I think it's okay overall.

A few more petunia seedpod images attached -- I went out the other day to take another look. Fascinating!