Some of the weights in the Verre D'Art site are more like "swirls" or "coatings of multiple chips".
The (nearly) clearly seen "ice-pick" flowers are, from top down: numbers 5 thru 9 and 12. Number 3 is also one of these but the photo does not show the relevant feature well.
The relevant features are:
a) flowers have a stem formed by pushing the tool into the coating of chips to form a column of stretched colour from that point
b) there is an air bubble at the point where the tool was used. The air bubble is an inevitable part of the design because the point where the tool was inserted always leaves an indentation and unless this is worked again (such as by marvering) the next coating of glass will trap the air at the indentation, thus forming the bubble.
Depending on how well and how quickly the item is worked, the air bubble could become separated from the flower or it could be elongated instead of virtually spherical.